Leser Compact Performance Threaded Safety Relief Valves

Leser Compact Performance Threaded Safety Relief Valves

Compact
performance
Threaded
Safety Relief Valves
Series 437
Type 437 · 438 · 439
Series 459
Type 459 · 462
CATALOG
The Safety Valve
Series 459
Packed lever H4
Series 459
Balanced bellows
design
Frontview 462 H4 GG
4c
Frontview 462 H2 GG SB
4c
Series 459
Cap H2
Series 459
Flanged version
Frontview 462 H2 GG
4c
Series 459
Plain lever H3
Frontview 462 H3 GG
4c
Threaded Safety Relief Valves Spring Loaded
Contents
Contents
General
Applications
5
Features and Benefits
5
Codes and Standards
5
Overview
6
Series 459
33
Materials
10
Materials
34
How to Order
• Numbering System
• Article Numbers
• Available Connections
12
14
15
How to Order
• Numbering System
• Article Numbers
• Available Connections
40
42
43
Dimensions and Weights
16
Dimensions and Weights
44
Pressure Temperature Ratings
18
Pressure Temperature Ratings
46
Accessories and Options
• Caps and Levers
• Metal Seat
• Soft Seal
• Heating Jacket
20
21
22
24
Spare Parts
25
Approvals Series 437
27
Accessories and Options
• Caps and Levers
• Balanced Bellows
• Metal Seat
• Soft Seal
• Heating Jacket
• Lift Indicator
48
50
51
52
54
55
Capacities Type 437
28
Spare Parts
56
Capacities Type 438 / 439
30
Approvals Series 459
58
Specification Sheet
32
Capacities Series 459
59
Specification Sheet
62
Series 437
9
Series 437
Cap H2
Series 437
Packed lifting device
H4
LWN 471.01
Series 437
Flanged version
3
Threaded Safety Relief Valves Spring Loaded
General
LESER´ s compact performance valves are spring loaded
LESER´ s compact performance valves are designed and
safety relief valves of specially com-
manufactured to highest standards and
pact design, developed in close coop-
compliant with and approved accord-
eration with plant engineers and ser-
ing to ASME (Sec. VIII, Div. 1), the
vice specialists to protect special
Canadian CRN, the European PED
processes and installations against
standard (CE), the German AD 2000-
overpressure.
Merkblatt A2 and those of many other
Extensive testing at the LESER ASME-
countries, covering requirements from
certified test lab together with up to
end-users, OEM´ s and engineering
date manufacturing processes ensure
companies worldwide.
the reliability of these state of the art
products.
Type 437 / 438 / 439
Type 459 / 462
4
LWN 471.02
Threaded Safety Relief Valves Spring Loaded
Applications · Features and Benefits · Codes and Standards
Applications
Features and Benefits
Codes and Standards
LESER´ s compact performance valves
represent the ultimate solution for critical applications such as
LESER´ s compact performance valves
cover a large variety of types, materials
and options to fit any application:
Scope of Design
● Four valve sizes from 1/2” through
11/2”
● Four orifice sizes from 0.3*D through F
● Threaded or flanged connections
ANSI or DIN, Inlet rating: class 150#
to 2500#
● Standard metal sealing: Type 437 and
Type 459 or
● Soft seal: Type 438, 439 and 462
● Optional stainless steel bellows for
back pressure compensation
● Packed or plain lifting lever or
gastight cap
● Heating jacket available for high viscosity fluids
LESER´ s compact performance valves
comply with the following codes and
standards:
●
●
●
●
●
●
●
Air/gas compressors and pumps
Technical gases and CO2 plants
Chemical equipment and piping
Pressure vessels and piping systems
containing gas, air, liquid or steam
LPG/LNG terminals, carriers etc.
Cryogenic systems and oxygen
application
Thermal relief
●
●
●
●
●
●
●
●
ASME Section VIII – National Board
certified capacities (single trim for
steam, gas and liquid service): UVstamp
ASME Section II - materials
ASME B 16.34 and ASME B16.5
API 527, NACE MR 0175
CRN
EN ISO 4126-1
PED 97 / 23 / EC (CE-marking),
VdTUEV-SV 100,
AD 2000-Merkblatt A2
Others
Compact design and High Performance
● Single trim for steam, gas and liquid
for less spare parts and easier maintenance
● Broad set pressure range up to
11600 psig
● Self-draining body design, avoids
residues and reduces corrosion
● One-piece spindle reduces friction
● Unobstructed seat bore for maximum capacity compared to nominal
size
● Heavy duty design Type 459M
● Various materials: chrome steel, stainless steel, Monel®‚ or Hastelloy®
● All parts machined from bar stock
for complete valves from special
materials within short time
● Variety of capacities and versions,
multiple choice of connections to fit
any application
Ease of plant design, installation,
operation and maintenance
● Replaceable nozzle and disc
● Hardened or optional stellited metal
sealing for longer product life
● Soft seat for superior tightness
● Ringless design, no adjustments
LWN 471.03
5
Threaded Safety Relief Valves Spring Loaded
General · Overview
Overview
Series 437
●
●
●
Series 459
Type 437: Metal to metal seat
Type 438: Soft seal, o-ring
Type 439: Soft seal, vulcanized
Common Features
● Very compact design
● Medium capacity
● Two standard body materials:
chrome steel, stainless steel
● All parts machined from bar stock –
various material options available
● Various connections
●
●
Type 459: Metal to metal seat
Type 462: Soft seal, o-ring
Common Features
● Compact design
● High capacity compared to nominal
sizes: for most common valve size
3/4” x 1” up to 1.5 D-orifice capacity
*
● Four different orifice sizes available
● Wide range of set pressures
● Optional balanced bellows
● Three body materials: cast iron, carbon steel, stainless steel
● Various connections
The diagram gives a quick overview
about the main features of LESER’s
compact performance valves: capacity
and tightness.
Tightness
Series 437
Series 459
Type 439 Vulcanized
soft seal
Type 438 O-ring disc
Type 437 Sealing plate
Type 462 O-ring disc
Type 459 Sealing plate
Type 437 Metal to metal
Type 459 Metal to metal
Capacity /
Orifice
Selection of Threaded Safety Relief Valves
Criteria
Series
Type
Set Pressure
> 2700psig
> 6000psig
High Flow Capacity
is required
≥ D Orifice
≥ F Orifice
Thermal Expansion application
Soft Seats
Metal Seats
Temperature > 536 °F
Temperature < -50 °F
Variable Back Pressure occurs
Threaded Connections are required
Flanged Connections are required
Note:
6
1
437
437
–
–
–
–
✓
–1
✓
–
✓
–
✓
✓
Flanged
SRV
459
438
–
–
–
–
✓
✓
439
–
–
–
–
✓
✓
–
–
–
–
✓
✓
–
–
–
–
✓
✓
459
✓
✓
✓
462
✓
e.g. 526
✓
–
✓
–
–
–1
✓
✓
✓
✓
✓
✓
–
–
✓
–
✓
✓
–
–
–
✓
✓
✓
–
✓
✓
✓
✓
✓
–
✓
Disc with sealing plate (e.g. PTFE) is available.
LWN 471.04
Threaded Safety Relief Valves Spring Loaded
General · Overview
Metal to metal seat
Type 437 and 459 provide for the protection of installations where the metal
to metal seat with its wide temperature
range and good chemical resistance is
suitable.
Set
Pressure
[psig]
Type 437 and 459 can be equipped
with an optional sealing plate disc for
low temperature soft seat applications.
459
0.044
inch2
459
0.099 inch2
437
Long
Version
0.122 inch2
437
Standard
Version
0.122 inch2
459
0.206 inch2
459
0.373 inch2
Capacity /
Orifice
Metal to metal seat
Type 437
Capacity
Set pressure
Sealing
Design
LWN 471.05
Orifice 0.5*D
up to 2610 psig
metal to metal
very compact
Type 459
Capacity
Set pressure
Sealing
Design
Orifice 0.3*D through F
up to 11600 psig
metal to metal
compact,
optional bellows,
heavy duty design 459M
Schnitt 459 H2 male
4c
7
Threaded Safety Relief Valves Spring Loaded
General · Overview
Soft seal
Type 438, 439 and 462 provide for the
protection of installations where a soft
seat for superior tightness is required
like for hard to hold gases.
Set
Pressure
[psig]
Type 439 allows maintained tightness
close to the set pressure especially at
lower set pressures due to the advanced design of the vulcanized soft seat.
462
0.099 inch2
438
Long Version
0.122 inch2
438
Standard
Version
0.122 inch2
462
0.206 inch2
462
0.373 inch2
439 0.122 inch2
Capacity/
Orifice
Soft seal
Type 438
Capacity
Set pressure
Sealing
Design
8
Orifice 0.5*D
up to 2610 psig
soft seal, O-ring
very compact
Type 439
Capacity
Set pressure
Sealing
Design
Orifice 0.5*D
up to 232 psig
vulcanized soft seal
very compact
Type 462
Capacity
Schnitt 439 H2 3 4x1 male
4c
Set pressure
Sealing
Design
Orifice 0.75*D
through F
up to 5075 psig
soft seal, O-ring
compact,
optional bellows
Schnitt 462 H2 male
4c
LWN 471.06
Threaded Safety Relief Valves Spring Loaded
Series 437
Series 437
Type 437 / 438 / 439
Type 437 / 438 / 439
Flanged Version
LWN 471.07
9
Series
437
Threaded Safety Relief Valves Spring Loaded
Materials Type 437
Materials Type 437
Item
Part Name
40
Type 4373
Chrome Steel
Type 4374
Stainless Steel
SA 479 316L
SA 479 316L
1
2
Inlet body
Outlet body
SA 479 316L
SA 479 430
7
Disc
12
16 / 17
Spindle
Spring plate
Hardened
stainless steel
AISI 420
AISI 430F
18
19
40
54
57
Adjusting screw
with bushing
Lock nut
Cap H2
Spring
Pin
AISI 430F
PTFE
Steel
Steel
Stainless steel
Stainless steel
316L
PTFE
316L
316L
Stainless steel
Stainless steel
61
Ball
Hardened
stainless steel
316
18
19
16
12
316L
54
316L
316L
2
17
57
61
7
1
Flanged Version
1
2
2.1
2.2
48
Inlet body
Outlet body
Outlet adaptor
Outlet flange
Inlet flange
SA 479 316L
SA 479 430
316L
316L
316L
SA 479 316L
SA 479 316L
316L
316L
316L
Type 437
40
18
19
16
2.2
2.1
12
54
2
17
57
61
7
1
48
Type 437
Flanged version
10
LWN 471.08
Threaded Safety Relief Valves Spring Loaded
Materials Type 438 · Type 439
Materials Type 438 · Type 439
40
Item
Part Name
Type 4383
Type 4393
Chrome Steel
Type 4384
Type 4394
Stainless Steel
1
2
Inlet body
Outlet body
SA 479 316L
SA 479 430
SA 479 316L
SA 479 316L
19
7
Disc with
soft seal 1
Spindle
Spring plate
316L
316L
16
AISI 420
AISI 430F
316L
316L
12
18
Adjusting screw
with bushing
AISI 430F
PTFE
316L
PTFE
54
19
40
54
57
Lock nut
Cap H2
Spring
Pin
Steel
Steel
Stainless steel
Stainless steel
316L
316L
Stainless steel
Stainless steel
61
Ball
Hardened
stainless steel
316
12
16 / 172
18
2
7
1
Flanged Version
1
2
2.1
2.2
48
Notes:
Inlet body
Outlet body
Outlet adaptor
Outlet flange
Inlet flange
CR
NBR
EPDM
FPM
FFKM
1
2
–
–
–
–
–
–
SA 479 316L
SA 479 430
316L
316L
316L
SA 479 316L
SA 479 316L
316L
316L
316L
Type 438
O-ring seal
Neoprene
Nitrile
Ethylene / Propylene
Fluorocarbon
Kalrez® (Type 438)
ISOLAST® (Type 439)
Schnitt 438 H2 3 4x1 male
4c
40
18
Item 17 only Type 439
16
2.2
2.1
12
54
2
2
17
7
57
1
61
48
7
1
Type 439
Vulcanized soft seal
Type 438
Flanged version
LWN 471.09
11
Schnitt 438 H2 Flansch
Series
437
Threaded Safety Relief Valves Spring Loaded
How to Order – Numbering System
How to Order
Numbering System
1
Article Number
1
2
3
Set Pressure
Please state unit (in gauge)!
4
Please do not exceed pressure range
mentioned in the spring charts.
437 4 . 314 2
1
2
3
Connections
Please refer to table “Available
Connections” on page 15.
Please state one option code for each,
inlet and outlet.
Type 437 / 438 / 439
Type
Types of sealing
437
Metal seat
Metal-to-metal
Metal-to-metal stellited
Soft seat
EPDM
NBR
CR
FFKM
(Kalrez®)
FKM
(Viton®)
Plastic seat
SP
PCTFE
PTDE-FDA
12
Vespel-SP1
Kel-F
Teflon
438
439
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
2
Material Code
3 – Body Material Chrome Steel
4 – Body Material Stainless Steel
3
Valve Code
Identifies valve size,
body material and orifice,
refer to page 14.
4
Code for lifting device
2 – Screwed cap
H2
4 – Packed lever
H4
4374.3142
100 psig
Article No.
Set Pressure
V62
V71
Connections
LWN 471.10
Threaded Safety Relief Valves Spring Loaded
How to Order – Numbering System
4
Options
Type 437 / 438 / 439
Option
Code
• Inlet body stellited
(Type 437 only)
• Soft seal material
(Type 438 / 439 only)
NBR
EPDM
CR
FKM
FFKM
• Heating jacket
L20
“N”
“F”
“K”
“L”
“C”
J30
J22
J21
J23
J20
Documentation
6
Code and Medium
Please select requested documentation:
1
Material test certificate
DIN EN 10204-3.1
Parts
Inlet body
Outlet body
Bonnet
Cap / lever cover
Disc
Option Code
H 01
L 34
L 30
L 31
L 23
H29
H01
Options
LWN 471.11
L20
5
2
1 . 1
1
Code
1. ASME Section VIII
2. CE / VdTUEV
3. ASME Section VIII
+ CE / VdTUEV
2
Medium
.1 Gases
.2 Liquids
.3 Steam
.0 Steam / Gases / Liquids
(valid only for CE /
VdTUEV)
L30
1.1
Documentation
Code and Medium
13
Series
437
Threaded Safety Relief Valves Spring Loaded
How to order · Article Numbers
How to order
Article Numbers Type 437
Type
Orifice
[Inch2 ]
Type 437
standard version
Body Material
Chrome Steel SA 479 430
Body Material
Stainless Steel SA 479 316L
Set Pressure
Range [psig]
Cap
H2
Packed Lever
H4
Set Pressure
Range [psig]
Cap
H2
Packed Lever
H4
1.5 - 1348
4373.2602
4373.2604
1.5 - 986
4374.3142
4374.3144
1349 - 2610
4373.2612
4373.2614
987 - 2610
4374.3152
4374.3154
0.122
Type 437
long version 1
Article Numbers Type 438
Type
Orifice
[Inch2 ]
Body Material
Chrome Steel SA479 430
Body Material
Stainless Steel SA 479 316L
Set Pressure
Range [psig]
Cap
H2
Packed Lever
H4
Set Pressure
Range [psig]
Cap
H2
Packed Lever
H4
7 - 1348
4383.2862
4383.2864
7 - 986
4384.2982
4384.2984
1349 - 2610
4383.2872
4383.2874
987 - 2610
4384.2992
4384.2994
Type 438
standard version
0.122
Type 438
long version1
Article Numbers Type 439
Type
Orifice
[Inch2 ]
Type 439
standard version
0.122
Note:
14
1
Body Material
Chrome Steel SA479 430
Body Material
Stainless Steel SA 479 316L
Set Pressure
Range [psig]
Cap
H2
Packed Lever
H4
Set Pressure
Range [psig]
Cap
H2
Packed Lever
H4
1.5 - 232
4393.2882
4393.2884
1.5 - 232
4394.2892
4394.2894
The “long version” is a high pressure version with extended outlet body.
LWN 471.12
Threaded Safety Relief Valves Spring Loaded
How to Order · Available Connections
Available Connections – Threaded ASME ANSI B1.20.1
Inlet
Size
Male NPT
Option Code
Outlet
Female NPT
Option Code
Size
Female NPT
Size
Option Code
1
V61
1
V58
1
V70
3
/4”
V62
3
/4”
V59
3
/4”
V77
1”
V63
1”
V60
1”
V71
/2”
/2”
/2”
Male thread
Available Connections – Flanged ASME ANSI B16.5
Inlet
Size
1
/2”
3
/4”
1”
Notes:
1
2
Outlet
ANSI-Class
Option
Code
150
Size
ANSI-Class
Option
Code
V01
150
V24
300
600
V02
300
600
V13
900
1500
V03
900
V14
2500
150
V04
V05
–
150
–
V15
300
600
V06
300
600
V16
900
1500
V07
900
V17
2500
150
V08
V09
–
150
–
V18
300
600
V10
300
600 1
V19
900
1500
V11
900 2
V20
2500
V12
–
–
1
/2”
3
/4”
1”
Female thread
Maximum inlet flange class: #1500
Extended center to face dimension outlet: 4 3/4” (120 mm)
Different sizes and flange classes inlet
and outlet can be combined.
Standard flange facing is raised face
(RF) according to ASME ANSI B16.5.
RJ flange facing as well as other facings
are available.
Flanged version
LWN 471.13
15
Series
437
Threaded Safety Relief Valves Spring Loaded
Dimensions and Weights Threaded / Flanged Connections US Units
a
s
s
b
Male thread
Female thread
Flanged version
Dimensions and Weights Threaded Connections US Units
Center to Face
[Inch]
Connection
Size
[Inch]
Orifice
[Inch2 ]
Male
1
1
/2” x /2”
1 ”x 3 ”
/2
/4
3 ”x 3 ”
/4
/4
3 ” x 1”
/4
0.122
1” x 1”
Note:
1
1
1
1
1
1
19
/64
19
/64
19
/64
25
/64
23
/64
c
55
Standard
Long
Version
Female
a
b
3
3
Hmax.
8 35/64
8 35/64
8 35/64
8 21/32
8 13/16
Hmax.1
9 3/8
9 3/8
9 3/8
9 31/64
9 41/64
1 /4
1 3/4
1 3/4
1 53/64
1 53/64
/64
55
/64
55
/64
55
/64
1 1/8
Weight
[lbs]
Outlet
Inlet
a
Height
[Inch]
1
1
1
1
1
/16
7
/16
7
/16
7
/16
7
/16
m
3.5
only Type 437 / 438
Dimensions and Weights Flanged Connections US Units
Center to Face
[Inch]
Connection
Size
[Inch]
Orifice
[Inch2 ]
Class
150
inlet
a
outlet
b
1
/2”
3 ”
/4
1
2
16
only Type 437 / 438
for 1/2” ANSI 150: 3
s
11
0.122
1”
Notes:
Flange Thickness
[Inch]
4
31
/642 3 15/16
/16
11
/16
3
/4
Height
[Inch]
Weight
[lbs]
Class
300 /
600
s
Class
900/
1500
s
Class
2500
Standard
Long
Version
s
Hmax.
Hmax.1
m
1
1
1 5/16
1 1/4
1 9/16
1 7/16
1 9/16
1 5/8
10 7/16
17
15.5
1
1 /8
11
/64
15/16
LWN 471.14
Threaded Safety Relief Valves Spring Loaded
Dimensions and Weights Threaded / Flanged Connections Metric Units
Dimensions and Weights Threaded Connections Metric Units
Center to Face
[mm]
Connection
Size
[Inch]
Orifice
[mm2 ]
Inlet
Male
1
1
/2” x /2”
1
/2” x 3/4”
3 ”x 3 ”
/4
/4
3 ” x 1”
/4
78.5
1” x 1”
Note:
1
Height
[mm]
Weight
[kg]
Outlet
Standard
Long
Version
a
c
Female
a
b
Hmax.
Hmax.1
m
33
33
33
36
35
22
22
22
22
27
44.5
44.5
44.5
46.5
46.5
30
37
37
37
37
195
195
195
198
197
216
216
216
219
218
1.6
only Type 437 / 438
Dimensions and Weights Flanged Connections Metric Units
Center to Face
[mm]
Connection
Size
[Inch]
Orifice
[mm2 ]
Class
150
inlet
a
outlet
b
1032
100
1
/2”
/4”
3
78.5
1”
Notes:
1
2
Flange Thickness
[mm]
Height
[mm]
Weight
[kg]
Class
900 /
1500
s
Class
2500
Standard
Long
Version
s
Class
300 /
600
s
s
Hmax.
Hmax.1
m
17
17
19
25
25
28
33
32
39
37
39
42
265
286
7
only Type 437 / 438
for 1/2” ANSI 150: 100 mm
LWN 471.15
17
Series
437
Threaded Safety Relief Valves Spring Loaded
Pressure Temperature Ratings Type 437 / 438 / 439 US Units
Pressure Temperature Ratings Type 437 – US Units1
Valve
Size
Orifice
[Inch2 ]
Set Pressure Range
[psig]
Body Material
Standard Version
Long Version
Temperature Range
according to
ASME [°F]
min.
max.
min.
max.
min.
max.
/2” – 1”
0.122
Chrome Steel
1.5
1348
1349
2610
- 20
+ 428
/2” – 1”
0.122
Stainless Steel
1.5
986
987
2610
- 450
+ 536
1
1
Pressure Temperature Ratings Type 438 – US Units1
Valve
Size
Orifice
[Inch2 ]
Set Pressure Range
[psig]
Body Material
Standard Version
Long Version
Temperature Range
according to
ASME [°F ]2
min.
max.
min.
max.
min.
max.
/2” – 1”
0.122
Chrome Steel
15
1348
1349
2610
- 20
+ 356
/2” – 1”
0.122
Stainless Steel
15
986
987
2610
- 49
+ 356
1
1
Pressure Temperature Ratings Type 439 – US Units1
Valve
Size
2
18
Standard Version
min.
max.
min.
max.
0.122
Chrome Steel
1.5
232
- 20
+ 356
/2” – 1”
0.122
Stainless Steel
1.5
232
- 49
+ 356
1
1
Body Material
Temperature Range
according to
ASME [°F ]2
/2” – 1”
1
Notes:
Orifice
[Inch2 ]
Set Pressure Range
[psig]
For flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limits
The temperature is limited by the soft seal material, please refer to soft seal selection table on page 23.
LWN 471.16
Threaded Safety Relief Valves Spring Loaded
Pressure Temperature Ratings Type 437 / 438 / 439 Metric Units
Pressure Temperature Ratings Type 437 – Metric Units1
Valve
Size
Orifice
[mm 2 ]
Set Pressure Range
[bar]
Body Material
Standard Version
Long Version
Temperature Range
according to
ASME [°C]
min.
max.
min.
max.
min.
max.
/2” – 1”
78.5
Chrome Steel
0.1
93
93
180
- 29
+ 220
/2” – 1”
78.5
Stainless Steel
0.1
68
68
180
- 268
+ 280
1
1
Pressure Temperature Ratings Type 438 – Metric Units1
Valve
Size
Orifice
[mm 2 ]
Set Pressure Range
[bar]
Body Material
Standard Version
Long Version
Temperature Range
according to
ASME [°C]2
min.
max.
min.
max.
min.
max.
/2” – 1”
78.5
Chrome Steel
1
93
93
180
- 29
+ 180
/2” – 1”
78.5
Stainless Steel
1
68
68
180
- 45
+ 180
1
1
Pressure Temperature Ratings Type 439 – Metric Units1
Valve
Size
2
Standard Version
min.
max.
min.
max.
78.5
Chrome Steel
0.1
16
- 29
+ 180
/2” – 1”
78.5
Stainless Steel
0.1
16
- 45
+ 180
1
1
Body Material
Temperature Range
according to
ASME [°C]2
/2” – 1”
1
Notes:
Orifice
[mm 2 ]
Set Pressure Range
[bar]
For flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limits.
The temperature is limited by the soft seal material, please refer to soft seal selection table on page 23.
LWN 471.17
19
Series
437
Threaded Safety Relief Valves Spring Loaded
Accessories and Options · Caps and Levers
Accessories and Options
Caps and Levers
Series 437 is available with the following lever designs
●
●
Materials – subassembly Item 40
Body Material
Chrome Steel
Cap H2
Packed lever H4, threaded design
The packed lever H4 provides some
special features:
● operation by turning the knob anticlock wise
● remains in open position until the
knob is screwed down again
● open and closed position is indicated
Item
1
2
2
12
13
14
16
19
22
23
24
25
Component
Lever cover
Cap
Knob
Spindle cap
Bolt
Support ring
Pin
O-ring
Stopper
Seal
Seal wire
Sealing nose
Cap H2
–
Steel
–
–
–
–
–
–
–
Plastic
316SS
316L
Packed lever H4
AISI 430F
–
AISI 430F
AISI 420
316SS
316SS
Stainless Steel
Viton
AISI 430F
Plastic
316SS
316L
Body Material
Stainless Steel
Cap H2
–
316L
–
–
–
–
–
–
–
Plastic
316SS
316L
Packed lever H4
316L
–
316L
316L
316SS
316SS
Stainless Steel
Viton
316L
Plastic
316SS
316L
22
16
2
14
12
2
19
1
Open
25
13
24
25
23
24
23
Closed
Cap H2
20
Packed lever H4
LWN 471.18
Threaded Safety Relief Valves Spring Loaded
Accessories and Options · Metal Seat
Metal Seat (Type 437)
The LESER metal seats (disc and nozzle)
are lapped to optical flatness to ensure
a tight shut off. LESER safety relief
valves are supplied with a standard
leak tightness according to API 527.
Type 4373
Standard material for the disc is a hardened stainless steel. The combination
of a hard disc material and a softer seat
material (316L) provides for improved
wear resistance and longer product life.
Type 4374
Disc and seat are provided in 316L
material for highest corrosion resistance.
Any other material which is available
from bar stock can be supplied as well
(e.g. Hastelloy®, Monel®, Alloy20,…).
57
57
7.3
7.3
7.1
7.1
7.2
7.2
1
1
Metal seat
Stellited sealing surfaces
Disc Materials subassembly Item 7
Item
Part Name
Type 4373
Body Material
Chrome Steel
Type 4374
Body Material
Stainless Steel
7.1
Disc
Hardened
stainless steel
Hardness 40 – 50 HRC
316L
7.2
7.3
57
Lifting aid
Nut
Pin
AISI 430F
Steel
316
316L
316L
316
Item
Part Name
Optional stellited sealing surfaces
7.1
Disc
316L stellited
Hardness 40 – 45 HRC
1
Inlet Body
316L stellited
Hardness 40 – 45 HRC
LWN 471.19
Stellited sealing surfaces
For high temperature applications, or
applications with abrasive fluids wear
resistant sealing surfaces are recommended.
The sealing surfaces of the disc, seat
or nozzle can be stellited by build-upwelding. The minimum thickness of the
stellite is 0.06 inch.
In addition to the corrosion resistance,
the stellited surface also offers a high
resistance to impact and sudden
changes in temperature.
21
Series
437
Threaded Safety Relief Valves Spring Loaded
Accessories and Options · Soft Seal
Soft Seal
O-ring disc
(Type 438)
Vulcanized soft seal
(Type 439)
Disc with sealing plate (Type 437, optional)
57
Code
letter 1
7.2
7.3
7.1
7.1
Code
letter1
7.3
57
7.1
Code
letter1
7.2
7.2
7.3
O-ring disc Type 438
Vulcanized soft seal disc Type 439
Disc with sealing plate Type 437
Application
Type 437, 438 and 439 are provided
with a soft seal disc for
● superior tightness
● maintained tightness close to the
set pressure
Disc with vulcanized soft seal
Type 439 with a vulcanized soft seat
allows maintained tightness close to
the set pressure especially at lower set
pressures.
Disc with sealing plate
For applications, where the increased
tightness of a soft seal is required but
the temperature is too low or too high
for an o-ring-disc, e.g. liquefied gases.
Note:
Features and Benefits
● three different designs for extended
application range
● minimized leakage and product loss
● large selection of soft seal materials
● simple replacement of soft seal
● standard ARP o-ring sizes
● one standard durometer per o-ring
material
● reduced maintenance costs
Code letter: Please refer to soft seal
selection table
1
For temperature limits and medium
resistance refer to the soft seal selection table.
Materials – subassembly Item 7
Type 438 O-ring disc
Item
22
Type 439 Vulcanized soft seal disc
Type 437 Disc with sealing plate
Part Name
Material
Part Name
Material
Part Name
Material
7.1
Disc
316L
Disc
316L with
vulcanized soft seal,
refer to soft seal
selection table
Disc
316L
7.2
Lifting aid
316L
Lifting aid
316L
Lifting aid
7.3
O-ring
57
Pin
Refer to soft seal
selection table
–
Nut
316L
Sealing plate
Pin
316
Pin
316L
Refer to soft seal
selection table
316
LWN 471.20
Threaded Safety Relief Valves Spring Loaded
Accessories and Options · Soft Seal
Type 437 Sealing plate Type 438 O-ring, Type 439 Vulcanized soft seal
Soft Seal Selection
Abbrevation
ASTM
1418
Designation
Trade name
CR
Neoprene®
(Chloroprene)
K
NBR
Buna - N®
(Nitrile-Butadiene)
EPDM
Tmin
Code- Option
letter1 Code
Tmax
Application 2
[ °F]
[ °C]
[ °F]
[ °C]
J21
-40
-40
212
100
Paraffin oil, silicone oil and grease, water and
waterbased solvents, refrigerants, ozone
N
J30
-13
-25
230
110
Hydraulic oil, vegetable and animal grease
and oil
Buna - EP®
(Ethylene-Propylene Diene)
D
J22
-49
-45
302
150
Hot water and superheated steam up to 302°F,
several organic and inorganic acids,
silicone oil and grease, FDA compliant
FPM
(FKM)
Viton®
(Fluorocarbon)
L
J23
-4
-20
356
180
For high temperature service (no superheated steam),
mineral oil and grease, silicone oil and grease, vegetable and animal grease and oil, ozone, FDA compliant
compound available on request
FFKM3
Kalrez ®
(Perfluoro)
C
J20
32
0
482
250
Nearly all chemicals, standard compound is
Kalrez® 6375 with steam resistance, FDA compliant
compound available on request
SP
VESPEL SP-1®
(Polyimide)
T
J49
-454
-270
572
300
High temperature and high pressure applications
(no steam), for chemical resistance refer to
manufacturers guide
PCTFE
Kel-F®
(Polychlorotrifluoroethylene)
G
J48
-454
-270
400
204
Cryogenic and refrigeration application,
flammable media, gaseous oxygene application
up to 725 psig at 140 ºF
PTFE
Teflon®
(Polytetrafluoroethylene)
A
J44
-300
-184
302
150
Nearly all chemicals
Other
Notes:
1
2
3
Please contact LESER LLC
The code letters will be stamped on the disc. For soft seal materials other than listed the code letter X will be used.
Pressure and temperature service must be considered in any case.
For type 439: material is ISOLAST®.
Set Pressure Limits
Sealing plate disc
Pressure Range
min.
Material
Registered Trademarks
max.
[psig]
[bar]
[psig]
[bar]
VESPEL
SP-1®
150
10
2610
180
Kel-F®
1.5
0.1
2610
180
Teflon®
LWN 471.21
1.5
0.1
145
10
Buna-N®, Teflon®,
Viton®, VESPEL SP-1®,
Neoprene®, Kalrez®
Buna EP®
Kel-F®
ISOLAST®
Company
DuPont
Bayer
3M
Busak +
Shamban
23
Series
437
Threaded Safety Relief Valves Spring Loaded
Accessories and Options · Heating Jacket
Heating Jacket (Type 437)
Application
Pressure relief valves in systems to be
protected from media which are viscous, sticky or have a tendency to
crystallize out of solution can be fitted
with a heating jacket.
For type 437 the outlet body is fitted
with a fabricated heating jacket. The
position of the heating connections is
shown in figure 1.
Specifications of the heating jacket
The operating data for the heating jacket
are shown on a separate name plate.
Operating
Pressure
Operating
Temperatures
pmax
Tmax
260 psig
410 °F
Available heating connections
Connection
Option Code
Couplings FNPT
S02 + H29
Type 437 with heating jacket
24
LWN 471.22
Threaded Safety Relief Valves Spring Loaded
Spare Parts · Discs · O-ring
Spare Parts
Discs – Type 437 metal to metal seat (Item 7)
Valve
Size
Orifice
[Inch2 ]
Type 4373
Hardened
stainless steel
Type 4374
Stainless Steel
316L
all
0.122
200.8739.9000
200.8749.9000
Discs – Type 438 soft seal with o-ring, disc material: 316L (Item 7)
Valve
Size
Orifice
[Inch2 ]
all
(standard
version)
0.122
all
(long
version)
0.122
O-ring size
ARP-no.
7
/16 x 3/32
ARP 111
7
/16 x 3/32
ARP 111
CR
Neoprene
EPDM
Ethylene
FPM (FKM)
Viton
NBR
Nitrile
FFKM
Kalrez®
K
F
L
N
C
200.8349.9751
200.8349.9741
200.8349.9771
200.8349.9781
200.8349.9791
200.8549.9053
200.8549.9042
200.8549.9073
200.8549.9083
200.8549.9091
CR
Neoprene
EPDM
Ethylene
FPM (FKM)
Viton
NBR
Nitrile
FFKM
Kalrez®
K
F
L
N
C
502.0107.2651
502.0107.2641
502.0107.2671
502.0107.2681
502.0107.2691
O-ring – Type 438 soft seal (Item 7.3)
Valve
Size
Orifice
[Inch2 ]
all
0.122
O-ring size
ARP-no.
7
/16 x 3/32
ARP 111
Discs – Type 439 with vulcanized soft seal (Item 7)
Valve
Size
Orifice
[Inch2 ]
all
0.122
LWN 471.23
CR
Neoprene
EPDM
Ethylene
FPM (FKM)
Viton
NBR
Nitrile
FFKM
ISOLAST®
K
F
L
N
C
200.9049.9051
200.9049.9041
200.9049.9071
200.9049.9081
200.9049.9091
25
Series
437
Threaded Safety Relief Valves Spring Loaded
Spare Parts · Inlet Bodies
Inlet Bodies Types 437 Threaded connections – Material 316L (Item 1)
Male NPT
Female NPT
Size
Orifice
[Inch2 ]
Part Number
1
0.122
3
/4”
1”
/2”
Size
Orifice
[Inch2 ]
Part Number
136.4449.9204
1
0.122
136.4449.9211
0.122
136.4549.9204
3
/4”
0.122
136.4549.9211
0.122
136.5849.9204
1”
0.122
136.5849.9211
/2”
Inlet Bodies Types 438 / 439 Threaded connections – Material 316L (Item 1)
Male NPT
Size
Orifice
[Inch2 ]
Part Number
1
0.122
3
/4”
1”
/2”
26
Female NPT
Size
Orifice
[Inch2 ]
Part Number
136.4949.9204
1
0.122
136.4949.9211
0.122
136.5449.9204
3
/4”
0.122
136.5449.9211
0.122
136.6849.9204
1”
0.122
136.6849.9211
/2”
LWN 471.24
Threaded Safety Relief Valves Spring Loaded
Approvals Series 437 · Rated slope
Approvals Series 437
Coefficient of Discharge 1
Country
Type
Fluid
Approval No.
437
S/G
L
S/G
L
0.122
438 / 439
37213
37189
37190
37202
Code
Orifice
ASME
Certified
K
ASME
Measured
KD
0.458
0.333
0.406
0.322
0.509
0.370
0.451
0.358
United
States
ASME Sec. VIII
Canada
CRN
437 / 438 / 439
S/G/L
OG0772.9C
0.122
Refer to ASME Sec. VIII
Country
Code
Type
Fluid
Approval No.
Orifice
Certified Coefficient of Discharge
K dr
Europe
PED 97 / 23 / EC
(CE-marking)
S/G
L
S/G
L
072020111
Z0008/0/21-1
0.122
0.50
0.35
0.40
0.33
437
438 / 439
αw
437
Germany
AD 2000Merkblatt A2
Others
Notes:
1
438 / 439
S/G
L
S/G
L
China:
Russia:
CSBQTS
DIN GOST
Ship classification authorities:
BV, DNV, GL, LROS, RINA
TUEV-SV 980
0.122
0.50
0.35
0.40
0.33
Acc. to ASME Sec. VIII the certified coefficient of discharge K is calculated by K = 0.9 * KD
For sizing acc. to ASME Sec. VIII K must be used in the sizing equations.
Rated slope
Within the capacity certification according to ASME Sec. VIII the coefficients
of discharge for series 437 are issued as
“rated slope values” instead of K values.
LWN 471.25
Rated slope values can be converted
into K values. The table above shows
the converted K values. The original
rated slope values are listed below.
Fluid
Rated slope Type 437
Rated slope Type 438 /439
S
2.86 lb / hr / PSIA
2.55 lb / hr / PSIA
G
1.02 SCFM / PSIA
0.904 SCFM / PSIA
L
1.54 GPM √PSID
1.49 GPM / √PSID
27
Series
437
Threaded Safety Relief Valves Spring Loaded
Capacities US Units · STEAM · AIR · WATER
Type 437
STEAM
AIR
WATER
ASME Section VIII
[lb/ hr]
ASME Section VIII
[S.C.F.M.]
ASME Section VIII
[US - G.P.M.]
Capacities US Units
Capacities US Units
Set pressure
[psig]
Orifice
0.122 Inch2
Set pressure
[psig]
Orifice
0.122 Inch2
Set pressure
[psig]
Orifice
0.122 Inch2
15
20
30
40
50
60
70
80
90
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
2000
2500
3000
94
108
137
168
200
232
263
295
326
358
421
484
547
611
674
737
800
863
926
990
1053
1116
1179
1242
1306
1621
1937
2253
2569
15
20
30
40
50
60
70
80
90
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
2000
2500
3000
33.5
38.6
48.9
60.1
71.4
82.7
93.9
105
117
128
150
173
195
218
241
263
286
308
331
353
376
398
421
443
466
579
692
804
917
1030
1143
1255
1368
1481
1594
1706
2270
2834
15
20
30
40
50
60
70
80
90
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
2000
2500
3000
6.54
7.39
8.86
10.2
11.4
12.5
13.5
14.5
15.3
16.2
17.7
19.1
20.5
21.7
22.9
24.0
25.0
26.1
27.1
28.0
28.9
29.8
30.7
31.5
32.3
36.2
39.6
42.8
45.7
48.5
51.1
53.6
56.0
58.3
60.5
62.6
72.3
80.8
Capacities for saturated steam according to ASME Section VIII (UV), based on
set pressure plus 10 % overpressure.
Capacities at 30 psig and bellow are
based on 3 psig overpressure.
28
Capacities US Units
Capacities for air according to ASME
Section VIII (UV), based on set pressure
plus 10 % overpressure at 60 °F.
Capacities at 30 psig and below are
based on 3 psig overpressure.
Capacities for water according to ASME
Section VIII (UV), based on set pressure
plus 10 % overpressure at 68 °F.
Capacities at 30 psig and below are
based on 3 psig overpressure.
LWN 471.26
Threaded Safety Relief Valves Spring Loaded
Capacities Metric Units · STEAM · AIR · WATER
Type 437
STEAM
AIR
WATER
ASME Section VIII
[kg / hr]
ASME Section VIII
[Sm3/ hr]
ASME Section VIII
[103 kg/ hr]
Capacities Metric Units
Capacities Metric Units
Capacities Metric Units
Set pressure
[bar]
Orifice
78.5 mm2
Set pressure
[bar]
Orifice
78.5 mm2
Set pressure
[bar]
Orifice
78.5 mm2
1
2
3
4
5
6
7
8
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
42
61
81
102
123
144
165
185
206
227
269
310
352
393
435
476
518
560
601
643
684
726
768
809
851
1059
1267
1
2
3
4
5
6
7
8
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
56
81
109
137
165
192
220
248
276
304
359
415
470
526
582
637
693
748
804
860
915
971
1026
1082
1138
1416
1694
1972
2250
2528
2806
3084
3362
3640
3918
4196
4474
4752
5030
1
2
3
4
5
6
7
8
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
1.46
1.98
2.42
2.80
3.13
3.42
3.70
3.95
4.19
4.42
4.84
5.23
5.59
5.93
6.25
6.56
6.85
7.13
7.40
7.66
7.91
8.15
8.39
8.62
8.84
9.89
10.8
11.7
12.5
13.3
14.0
14.7
15.3
15.9
16.5
17.1
17.7
18.2
18.8
Capacities for saturated steam according to ASME Section VIII (UV), based on
set pressure plus 10 % overpressure.
Capacities at 2.07 bar (30 psig) and
below are based on 0.207 bar (3 psig)
overpressure.
LWN 471.27
Capacities for air according to ASME
Section VIII (UV), based on set pressure
plus 10 % overpressure at 16 °C.
Capacities at 2.07 bar (30 psig) and
below are based on 0.207 bar (3 psig)
overpressure.
Capacities for water according to ASME
Section VIII (UV), based on set pressure
plus 10 % overpressure at 20 °C.
Capacities at 2.07 bar (30 psig) and
below are based on 0.207 bar (3 psig)
overpressure.
29
Series
437
Threaded Safety Relief Valves Spring Loaded
Capacities US Units · STEAM · AIR · WATER
Type 438 / 439
STEAM
AIR
WATER
ASME Section VIII
[lb/ hr]
ASME Section VIII
[S.C.F.M.]
ASME Section VIII
[US - G.P.M.]
Capacities US Units
Capacities US Units
Set pressure
[psig]
Orifice
0.122 Inch2
Set pressure
[psig]
Orifice
0.122 Inch2
Set pressure
[psig]
Orifice
0.122 Inch2
15
20
30
40
50
60
70
80
90
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
2000
2500
83
96
121
149
177
205
233
261
289
317
373
429
485
541
597
653
709
765
821
877
933
989
1045
1101
1157
1437
15
20
30
40
50
60
70
80
90
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
2000
2500
30
34
43
53
63
73
83
93
103
113
133
153
173
193
213
233
253
273
293
313
333
353
373
393
413
513
613
713
813
913
1013
1113
1213
1313
1413
1513
2012
2512
15
20
30
40
50
60
70
80
90
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
2000
2500
6.32
7.15
8.56
9.89
11.1
12.1
13.1
14.0
14.8
15.6
17.1
18.5
19.8
21.0
22.1
23.2
24.2
25.2
26.2
27.1
28.0
28.8
29.7
30.5
31.3
35.0
38.3
41.4
44.2
46.9
49.4
51.9
54.2
56.4
58.5
60.5
69.9
78.2
Capacities for saturated steam according to ASME Section VIII (UV), based on
set pressure plus 10 % overpressure.
Capacities at 30 psig and bellow are
based on 3 psig overpressure.
30
Capacities US Units
Capacities for air according to ASME
Section VIII (UV), based on set pressure
plus 10 % overpressure at 60 °F.
Capacities at 30 psig and below are
based on 3 psig overpressure.
Capacities for water according to ASME
Section VIII (UV), based on set pressure
plus 10 % overpressure at 68 °F.
Capacities at 30 psig and below are
based on 3 psig overpressure.
LWN 471.28
Threaded Safety Relief Valves Spring Loaded
Capacities Metric Units · STEAM · AIR · WATER
Type 438 / 439
STEAM
AIR
WATER
ASME Section VIII
[kg / hr]
ASME Section VIII
[Sm3/ hr]
ASME Section VIII
[103 kg/ hr]
Capacities Metric Units
Capacities Metric Units
Capacities Metric Units
Set pressure
[bar]
Orifice
78.5 mm2
Set pressure
[bar]
Orifice
78.5 mm2
Set pressure
[bar]
Orifice
78.5 mm2
1
2
3
4
5
6
7
8
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
37
54
72
91
109
128
146
164
183
201
238
275
312
349
386
422
459
496
533
570
607
644
680
717
754
1
2
3
4
5
6
7
8
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
50
72
97
121
146
171
195
220
244
269
318
368
417
466
516
565
614
663
713
762
811
861
910
959
1008
1255
1501
1748
1994
2241
2487
2734
2980
3227
3473
3720
3966
4213
4459
1
2
3
4
5
6
7
8
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
1.42
1.91
2.34
2.70
3.02
3.31
3.58
3.82
4.06
4.28
4.68
5.06
5.41
5.74
6.05
6.34
6.62
6.89
7.15
7.40
7.65
7.88
8.11
8.33
8.55
9.56
10.5
11.3
12.1
12.8
13.5
14.2
14.8
15.4
16.0
16.6
17.1
17.6
18.1
Capacities for saturated steam according to ASME Section VIII (UV), based on
set pressure plus 10 % overpressure.
Capacities at 2.07 bar (30 psig) and
below are based on 0.207 bar (3 psig)
overpressure.
LWN 471.29
Capacities for air according to ASME
Section VIII (UV), based on set pressure
plus 10 % overpressure at 16 °C.
Capacities at 2.07 bar (30 psig) and
below are based on 0.207 bar (3 psig)
overpressure.
Capacities for water according to ASME
Section VIII (UV), based on set pressure
plus 10 % overpressure at 20 °C.
Capacities at 2.07 bar (30 psig) and
below are based on 0.207 bar (3 psig)
overpressure.
31
Series
437
Threaded Safety Relief Valves Spring Loaded
Specification Sheet
636 326 9185
Please fax to:
or your local representative
Specification Sheet
Company:
Phone:
Location:
Fax:
Name:
e-mail:
Reference:
Date:
GENERAL
1 ■ Item No.:
2 ■ Tag No.:
3 ■ Customer:
4 ● Equipment:
5 ● Enquiry/Order No.:
6 ● Delivery time:
7 ● Number of valves:
8 ● Number of spare valves:
9 ■ Basis of Selection: Code:
■ ASME VIII
■ PED 97/ 23 / EC (CE-marking)
■ other:
10 ■ Documentation: Material test report
■ inlet body
■ outlet body
■ other:
SERVICE CONDITIONS
■ Steam (S)
11 ■ Fluid and state:
12 ■ Molecular weight:
13 ● Coefficient C:
14 ● Ratio of specific heats k:
15 ● Compressibility factor Z:
16 ■ Spec. gravity / units:
17 ● Viscosity / units:
18 ■ Relieving temperature / units:
19 ■ Required capacity / units:
VALVE CONSTRUCTION
27 ● Orifice Designation:
28 ● Connection inlet
29 ● Size:
30 ● Thread type or Flange class:
■ RJ
31 ● Facing type: ■ RF
20
21
22
23
24
25
26
3
of
■ Fire
■ Two phase
■ ...... %
■ 20 %
■ ...... %
■ other:
■
■
■
■
■
EPDM
other:
carbon steel
other:
Yes
■ No
■ cap H2
■ Please fill in these fields in any case.
● Please fill in these fields if possible.
▲ These fields will be completed by the supplier.
.
Article No.
32
■ Liquid (L)
Gas (G)
Set pressure / units:
Operating pressure / units:
Cold diff. set pressure / units:
Const. back pressure / units:
Var. back pressure / units:
■ 10 %
Overpressure:
■ 10 %
Blowdown:
■ 4: Stainless steel
37 ● Soft seat ■ CR
■ NBR
seal:
■ FPM ■ FFKM
38 ● Spring: ■ high temp. alloy steel
■ stainless steel
39 ● Comply with NACE MR 0175
SIZING AND SELECTION
42 ▲ Required orifice area / units:
43 ▲ Selected orifice area / units:
44 ▲ Coeff. of discharge:
45 ▲ Calculated capacity / units:
Order Code
4
■
■
●
●
■
■
●
●
Connection outlet
Size:
Thread type or Flange class:
■ RF
■ RJ
Facing type:
■ other:
MATERIALS
32 ● LESER Material Code
■ 3: Chrome steel
33 ● LESER Type: ■ 437
■ 438
■ 439
34 ■ Inlet body:
35 ● Outlet body:
36 ● Disc (Type 437): ■ SS hardened
■ 316L
●
■ other:
ACCESSORIES AND OPTIONS
40 ■ Lifting lever: ■ packed H4
41 ● Others (specify):
Page:
Set Pressure
Connections
Options
Documentation
Code and
Medium
LWN 471.30
Threaded Safety Relief Valves Spring Loaded
Series 459
Series 459
Type 459 / 462
Type 459 / 462
carbon steel
LWN 471.31
33
Series
459
Threaded Safety Relief Valves Spring Loaded
Materials Type 459
40
Materials Type 459
18
Threaded Connections
19
Item
Part Name
Type 4593
SG
Iron
1
2
Inlet body
Outlet body
SA 479 316L
Gr. 60-40-18
Type 4592
Carbon
Steel
Type 4594
Stainless
Steel
SA 479 316L
SA 479 316L
SA 479 316L
SA 479 316L
Hardened
Hardened
stainless steel stainless steel
7
Disc
8
Guide
AISI 430F
tenifer
9
Bonnet
Gr. 60-40-18
12
Spindle
AISI 420
Carbon Steel
SA 105
AISI 420
14
16/17
Split ring
Spring plate
AISI 430F
Steel
AISI 430F
Steel
316L
316L
18
Adjusting
screw with
bushing
AISI 430F
PTFE
AISI 430F
PTFE
316L
PTFE
Lock nut
Cap H2
Steel
Steel
Steel
Steel
316L
316L
Spring
standard
Carbon
Steel
Carbon
Steel
Stainless
Steel
19
40
54
Spring
optional
AISI 430F
tenifer
9
16
54
316L
12
316L
17
14
SA 479 316L
60
316L
8
57
61
7
2
1
Type 459
High temp.
High temp.
alloy steel or alloy steel or
stainless steel stainless steel
57
Pin
316
316
316
40
60
Gasket
Graphite /
316L
Graphite /
316L
Graphite /
316L
18
61
Ball
316
316
316
19
SA 479 316L
SA 479 316L
316L
316L
316L
SA 479 316L
SA 479 316L
316L
316L
316L
Flanged Version
1
2
2.1
2.2
48
Inlet body
SA 479 316L
Outlet body
Gr. 60-40-18
Outlet adaptor
316L
Outlet flange
316L
Inlet flange
316L
Schnitt 459 H2 male
4c
9
16
54
12
2.2
17
2.1
14
60
8
57
61
7
2
1
48
Type 459
Flanged version
34
LWN 471.32
Threaded Safety Relief Valves Spring Loaded
Materials Type 459 – Balanced Bellows Design
Materials Type 459 – Balanced Bellows Design
40
18
Threaded Connections
19
Type 4592
Carbon
Steel
Type 4594
Stainless
Steel
SA 479 316L
SA 479 316L
SA 479 316L
SA 479 316L
Item
Part Name
Type 4593
SG
Iron
1
2
Inlet body
Outlet body
SA 479 316L
Gr. 60-40-18
7
Disc
8
Guide
AISI 430F
tenifer
AISI 430F
tenifer
316L
9
Bonnet
Gr. 60-40-18
Carbon Steel
SA 105
SA 479 316L
11 Bonnet spacer SA 479 316L
12
Spindle
AISI 420
14
Split ring
AISI 430F
15
Bellows
316L
16 / 17 Spring plate
Steel
SA 479 316L
AISI 420
AISI 430F
316L
Steel
SA 479 316L
316L
316L
316L
316L
Hardened
Hardened
stainless steel stainless steel
54
12
17
14
60
11
15
60
57
Adjusting
screw with
bushing
AISI 430F
PTFE
AISI 430F
PTFE
316L
PTFE
19
40
Lock nut
Cap H2
Steel
Steel
Steel
Steel
316L
316L
Spring
standard
Carbon
Steel
Carbon
Steel
Stainless
Steel
Spring
optional
16
316L
18
54
9
High temp.
High temp.
alloy steel or alloy steel or
stainless steel stainless steel
57
Pin
316
316
316
60
Gasket
Graphite /
316L
Graphite /
316L
Graphite /
316L
61
Ball
316
316
316
SA 479 316L
SA 479 316L
316L
316L
316L
SA 479 316L
SA 479 316L
316L
316L
316L
61
7
2
1
Type 459
Balanced bellows design
Schnitt 459 H2 male SB
4c
Flanged Version
1
2
2.1
2.2
48
Inlet body
SA 479 316L
Outlet body
Gr. 60-40-18
Outlet adaptor
316L
Outlet flange
316L
Inlet flange
316L
LWN 471.33
35
Series
459
Threaded Safety Relief Valves Spring Loaded
Materials Type 462
40
Materials Type 462
18
Threaded Connections
19
Type 4622
Carbon
Steel
Type 4624
Stainless
Steel
Item
Part Name
Type 4623
SG
Iron
1
2
Inlet body
Outlet body
SA 479 316L
Gr. 60-40-18
SA 479 316L
SA 479 316L
SA 479 316L
SA 479 316L
7
Disc with
soft seal1
316L
316L
316L
12
8
Guide
AISI 430F
tenifer
AISI 430F
tenifer
316L
17
9
Bonnet
Gr. 60-40-18
Carbon Steel
SA 105
SA 479 316L
12
14
16
Spindle
Split ring
Spring plate
AISI 420
AISI 430F
Steel
AISI 420
AISI 430F
Steel
316L
316L
316L
18
Adjusting
screw with
bushing
AISI 430F
PTFE
AISI 430F
PTFE
316L
PTFE
19
40
Lock nut
Cap H2
Steel
Steel
Steel
Steel
316L
316L
Spring
standard
Carbon
Steel
Carbon
Steel
Stainless
Steel
54
Spring
optional
9
16
54
14
60
8
57
61
7
2
1
Type 462
High temp.
High temp.
alloy steel or alloy steel or
stainless steel stainless steel
Schnitt 462 H2 male
4c
57
Pin
316
316
316
60
Gasket
Graphite /
316L
Graphite /
316L
Graphite /
316L
40
61
Ball
316
316
316
18
Flanged Version
1
2
2.1
2.2
48
Note:
Inlet body
SA 479 316L
Outlet body
Gr. 60-40-18
Outlet adaptor
316L
Outlet flange
316L
Inlet flange
316L
CR
NBR
EPDM
FPM
FFKM
1
–
–
–
–
–
Neoprene
Nitrile
Ethylene / Propylene
Fluorocarbon
Kalrez®
SA 479 316L
SA 479 316L
316L
316L
316L
9
SA 479 316L
SA 479 316L
316L
316L
316L
16
54
12
2.2
2.1
17
60
8
7
2
1
48
Type 462
Flanged version
36
LWN 471.34
Threaded Safety Relief Valves Spring Loaded
Materials Type 462 – Balanced Bellows Design
Materials Type 462 – Balanced Bellows Design
40
18
Threaded Connections
19
Type 4622
Carbon
Steel
Type 4624
Stainless
Steel
Item
Part Name
Type 4623
SG
Iron
1
2
Inlet body
Outlet body
SA 479 316L
Gr. 60-40-18
SA 479 316L
SA 479 316L
SA 479 316L
SA 479 316L
7
Disc with
soft seal1
316L
316L
316L
8
Guide
AISI 430F
tenifer
AISI 430F
tenifer
316L
9
Bonnet
Gr. 60-40-18
CarbonSteel
SA 105
SA 479 316L
11 Bonnet spacer SA 479 316L
12
Spindle
AISI 420
14
Split ring
AISI 430F
15
Bellows
316L
16 / 17 Spring plate
Steel
SA 479 316L
AISI 420
AISI 430F
316L
Steel
SA 479 316L
316L
316L
316L
316L
54
12
17
60
11
15
60
57
Adjusting
screw with
bushing
AISI 430F
PTFE
AISI 430F
PTFE
316L
PTFE
19
40
Lock nut
Cap H2
Steel
Steel
Steel
Steel
316L
316L
Spring
standard
Carbon
Steel
Carbon
Steel
Stainless
Steel
Spring
optional
16
14
18
54
9
61
7
2
1
Type 462
Balanced bellows design
High temp.
High temp.
alloy steel or alloy steel or
stainless steel stainless steel
57
Pin
316
316
316
60
Gasket
Graphite /
316L
Graphite /
316L
Graphite /
316L
61
Ball
316
316
316
SA 479 316L
SA 479 316L
316L
316L
316L
SA 479 316L
SA 479 316L
316L
316L
316L
Schnitt 462 H2 male SB
4c
Flanged Version
1
2
2.1
2.2
48
Note:
Inlet body
SA 479 316L
Outlet body
Gr. 60-40-18
Outlet adaptor
316L
Outlet flange
316L
Inlet flange
316L
CR
NBR
EPDM
FPM
FFKM
1
LWN 471.35
–
–
–
–
–
Neoprene
Nitrile
Ethylene / Propylene
Fluorocarbon
Kalrez®
37
Series
459
Threaded Safety Relief Valves Spring Loaded
Materials Type 459 · Heavy Duty Design
40
Materials Type 459 Heavy Duty Design
18
Threaded Connections
19
Item
Part Name
Type 4594
Stainless Steel
1
2
7
8
9
12
Inlet body
Outlet body
Disc
Guide
Bonnet
Spindle
SA 479 316L
SA 479 316L
316L
316L
SA 479 316L
316L
14
16/17
Split ring
Spring plate
316L
316L
18
Adjusting screw
with bushing
316L
PTFE
Lock nut
Cap H2
Spring
316L
316L
Stainless Steel
Pin
Gasket
Ball
316
Graphite / 316L
316
19
40
54
57
60
61
9
16
54
12
17
14
60
8
57
61
7
2
Type 459
Heavy duty design
1
40
18
19
9
16
54
12
17
14
60
11
15
60
57
61
7
2
1
38
Type 459
Heavy duty design with
balanced bellows
LWN 471.36
Threaded Safety Relief Valves Spring Loaded
Material Options Type 4594
The Heavy Duty Design of Type 459
offers the possibility to easily obtain
special material versions. The fact that
all product wetted parts are machined
from bar stock materials makes it easier and faster to fulfill almost all material requirements according to the material availability.
Two special material levels are available:
● Level 1
special materials for the trim =
wetted parts in closed position
● Level 2
special material for trim and outlet =
wetted parts in open position
Material Options Type 4594 Heavy Duty Design
Level 1
Trim
Item
Part Name
Item
Part Name
1
Inlet body
1
Inlet body
7
Disc
2
Outlet body
7
Disc
11
Bonnet spacer
15
Bellows1
57
Pin
61
Ball
Option Code
Material
Option Code
Material
Grade HA
Hastelloy®
Grade HB
Hastelloy®
Grade MA
Monel®
Grade MB
Monel®
Grade DA
Duplex®
Grade DB
Duplex®
Note:
LWN 471.37
Level 2
Trim and Outlet
1
Available in 316L, Duplex®, Hastelloy®, Inconel®, Monel®. Other materials on request.
39
Series
459
Threaded Safety Relief Valves Spring Loaded
How to Order – Numbering System
How to Order
Numbering System
1
Article Number
1
2
3
Set Pressure
Please state unit (in gauge)!
4
Please do not exceed pressure range
mentioned in the spring charts.
459 4 . 255 2
1
2
3
Connections
Please refer to table “Available
Connections” on page 43.
Please state one option code for each,
inlet and outlet.
Type 459 / 462
Type
Types of sealing
459
Metal seat
Metal-to-metal
Metal-to-metal stellited
Soft seat
EPDM
NBR
CR
FFKM
(Kalrez®)
FKM
(Viton®)
Plastic seat
SP
PCTFE
PTDE-FDA
2
Vespel-SP1
Kel-F
Teflon
462
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
Material Code
2 – Body Material Carbon Steel
3 – Body Material SG iron
4 – Body Material Stainless Steel
3
Valve Code
Identifies valve size,
body material and orifice,
refer to page 14.
4
Code for lifting device
2 – Screwed cap
H2
3 – Plain lever
H3
4 – Packed lever
H4
40
4594.2552
100 psig
Article No.
Set Pressure
V62
V71
Connections
LWN 471.38
Threaded Safety Relief Valves Spring Loaded
How to Order – Numbering System
4
Options
Type 459 / 462
Option
Code
• Outlet body
L19
heavy duty design
(Type 459)
• Inlet body stellited
L20
(Type 459)
• Soft seal material
NBR “N”
J30
(Type 462)
EPDM “F”
J22
CR
“K”
J21
FKM “L”
J23
FFKM “C”
J20
• Stainless steel bellows
p < 580 psig
J78
p > 580 psig
J78 + J55
Hastelloy ®
J81
• Elastomer bellows
J79
• Heating jacket
H29
• Heating jacket
H33
bonnet spacer
• High temperature
X01
alloy spring
• Stainless steel spring
X04
J78
Documentation
6
Code and Medium
Please select requested documentation:
1
Material test certificate
DIN EN 10204-3.1
Parts
Inlet body
Outlet body
Bonnet
Cap / lever cover
Disc
H01
Options
LWN 471.39
5
Option Code
H 01
L 34
L 30
L 31
L 23
2
1 . 1
1
Code
1. ASME Section VIII
2. CE / VdTUEV
3. ASME Section VIII
+ CE / VdTUEV
2
Medium
.1 Gases
.2 Liquids
.3 Steam
.0 Steam / Gases / Liquids
(valid only for CE /
VdTUEV)
L30
1.1
Documentation
Code and Medium
41
Series
459
Threaded Safety Relief Valves Spring Loaded
How to Order · Article Numbers
How to order
Article Numbers Type 459
Type 4593
Body Material
SG Iron
Type 4592
Body Material
Carbon Steel
Type 4594
Body Material
Stainless Steel
Orifice
[Inch2 ]
Cap
H2
Packed Lever
H4
Plain Lever
H3
Cap
H2
Packed Lever
H4
Plain Lever
H3
Cap
H2
Packed Lever
H4
0.099
4593.2502
4593.2504
4593.2503
4592.2472
4592.2474
4592.2473
4594.2552
4594.2554
0.206
4593.2512
4593.2514
4593.2513
4592.2482
4592.2484
4592.2483
4594.2562
4594.2564
0.373
4593.2522
4593.2524
4593.2523
4592.2492
4592.2494
4592.2493
4594.2572
4594.2574
Article Numbers Type 462
Type 4623
Body Material
SG Iron
Type 4622
Body Material
Carbon Steel
Type 4624
Body Material
Stainless Steel
Orifice
[Inch2 ]
Cap
H2
Packed Lever
H4
Plain Lever
H3
Cap
H2
Packed Lever
H4
Plain Lever
H3
Cap
H2
Packed Lever
H4
0.099
4623.2902
4623.2904
4623.2903
4622.3772
4622.3774
4622.3773
4624.2952
4624.2954
0.206
4623.2912
4623.2914
4623.2913
4622.3782
4622.3784
4622.3783
4624.2962
4624.2964
0.373
4623.2922
4623.2924
4623.2923
4622.3792
4622.3794
4622.3793
4624.2972
4624.2974
Article Numbers Type 459
Heavy duty design
Article Numbers Type 462
Heavy duty design
Type 4594
Body Material
Stainless Steel
Orifice
[Inch2 ]
Cap
H2
Packed Lever
H4
0.044 (L)
0.044 (S/G)
0.099
0.206
4594.2532 1
4594.2542 2
4594.2582
4594.2592
4594.2534 1
4594.2544 2
4594.2584
4594.2594
Notes:
1
2
42
Type 4624
Body Material
Stainless Steel
Orifice
[Inch2 ]
Cap
H2
Packed Lever
H4
0.099
4624.2252
4624.2254
0.206
4624.2272
4624.2274
Liquid service
Steam and gas service
LWN 471.40
Threaded Safety Relief Valves Spring Loaded
How to Order · Available Connections
Male thread
Female thread
Flanged version
Available Connections – Threaded Option codes
Schnitt 459 H2 female
Inlet Male NPT
Schnitt 459 H2 male
4cOrifice [Inch2 ]
Orifice [Inch2 ]
Size
0.044
0.099
0.206
0.373
1
V61
V61
V61
–
3
/4”
V62
V62
V62
–
1”
V63
V63
V63
11/2”
–
–
–
/2”
Outlet4cFemale NPT
Inlet Female NPT
Size
Orifice [Inch2 ]
0.044
0.099
0.206
0.373
1
V58
V58
V58
–
3
/4”
V59
V59
V59
V59
V63
1”
V60
V60
V60
V64
11/2”
–
–
–
/2”
Size
0.044
0.099
0.206
0.373
1
–
–
–
–
3
/4”
–
–
–
–
V60
1”
V71
V71
V71
–
V75
11/2”
–
V72
V72
V72
/2”
Available Connections – Flanged ANSI B16.5 Option codes
Inlet
Orifice [Inch2 ]
Size
ANSI-Class
150
300 / 600
1 ”
/2
900 / 1500
2500
150
300
/ 600
3 ”
/4
900 / 1500
2500
150
300 / 600
1”
900 / 1500
2500
–
11/2”
–
–
Notes:
1
2
0.044
V01
V02
V03
V04
V05
V06
V07
V08
V09
V10
V11
V12
–
–
–
0.099
V01
V02
V03
V04
V05
V06
V07
V08
V09
V10
V11
V12
–
–
–
0.206
–
–
–
–
V05
V06
V07
V08
V09
V10
V11
V12
–
–
–
Outlet
Orifice [Inch2 ]
0.373
–
–
–
–
V05
V06
V07
V08
V09
V10
V11
V12
–
–
–
Size
ANSI-Class
–
–
–
–
–
–
–
–
–
–
150
300 / 6001
1”
9002
–
150
11/2” 300 / 600
900
0.044
–
–
–
–
–
–
–
–
V18
V19
V20
–
–
–
–
0.099
–
–
–
–
–
–
–
–
V18
V19
V20
–
V21
V22
V23
0.206
–
–
–
–
–
–
–
–
V18
V19
V20
–
V21
V22
V23
0.373
–
–
–
–
–
–
–
–
–
–
–
–
V21
V22
V23
maximum inlet flange class: #1500
extended center to face dimension outlet: 4 3/4” (120 mm)
LWN 471.41
43
Series
459
Threaded Safety Relief Valves Spring Loaded
Dimensions and Weights Type 459 / 462
Male thread
Female thread
Flanged version
Dimensions and Weights Threaded Connections US Units
Center to Face
[Inch]
Connection
Size
[Inch]
Inlet
Male
a
1
/2” x 1”
3 ” x 1”
/4
1” x 1”
3
/4” x 11/2”
1” x 11/2”
11/2” x 11/2”
Note:
1
Female
a
2 11/64
2 11/64
2 11/64
2 1/4
2 1/4
2 63/64
c
3
1 /4
1 3/4
1 47/64
1 29/32
1 57/64
2 1/8
55
/64
55
/64
1 1/8
55
/64
1 1/8
1 1/8
Height
[Inch]
Weight
[lbs]
Outlet
Standard
Bellows
b
Hmax.
11 11/16
11 11/16
11 27/32
11 27/32
12 1/64
12 1/8
Hmax.1
12 61/64
12 61/64
13 7/64
13 7/64
13 17/64
13 25/64
2
61
/64
m
5.7
5.7
5.7
6.6
6.6
6.6
not for orifice 0.044 inch2
Dimensions and Weights Flanged Connections US Units
Center to Face
[Inch]
Orifice
[Inch2]
0.044
0.099
0.206
0.373
44
Inlet
150 RF –
2500 RF
a
300 RJ –
1500 RJ
a
2500 RJ
15
7
31
3 /16
3 15/16
3 15/16
4 9/64
4
4
4
4
/32
/32
7
/32
9
/16
7
a
4
4
4
4
/64
/64
31
/64
27
/32
Height
[Inch]
Weight
[lbs]
Outlet
Standard
Bellows
150 RF –
600 RF
b
H
H
m
63
–
14 1/4
14 1/4
14 3/8
17.6
31
3
15
/16
12 /64
12 63/64
12 63/64
13 7/64
LWN 471.42
Threaded Safety Relief Valves Spring Loaded
Dimensions and Weights Type 459 / 462 · Flange Thickness
Dimensions and Weights Threaded Connections Metric Units
Center to Face
[mm]
Connection
Size
[Inch]
Inlet
Male
a
45
45
44
49
48
54
1
/2” x 1”
3
/4” x 1”
1” x 1”
3
/4” x 11/2”
1” x 11/2”
11/2” x 11/2”
Note:
1
Female
a
55
55
55
57
57
76
c
22
22
27
22
27
27
Height
[mm]
Weight
[kg]
Outlet
Standard
Bellows
b
Hmax.
Hmax.1
m
75
275
275
274
279
278
281
307
307
306
311
310
313
2.6
2.6
2.6
3
3
3
not for orifice 0.044 inch2
Dimensions and Weights Flanged Connections Metric Units
Center to Face
[mm]
Orifice
[mm2]
Inlet
150 RF –
2500 RF
a
300 RJ –
1500 RJ
a
2500 RJ
100
100
100
105
107
107
107
116
114
114
114
28.2
63.6
133
241
a
Height
[mm]
Outlet
Standard
Bellows
150 RF –
600 RF
b
Hmax.
Hmax.
330
330
330
333
–
100
123
Flange Thickness US Units
Class
150
s
1
/2”
/4”
3
1”
11/2”
LWN 471.43
5
/8
/16
3
/4
15
/16
11
Flange Thickness
[mm]
Class
900/1500
s
s
s
1
7
/16
/16
1 1/8
1 3/16
15
8
Flange Thickness Metric Units
Class
300/600
15
m
362
362
365
Flange Thickness
[Inch]
Connection
Size
[Inch]
Weight
[kg]
1 /4
1 1/4
1 9/16
1 9/16
Class
2500
1 /16
1 1/2
1 5/8
2
Connection
Size
[Inch]
1
/2”
/4”
3
1”
11/2”
Class
150
Class
300/600
Class
900/1500
Class
2500
s
s
s
s
17
17
19
24
25
25
28
31
33
32
39
40
37
39
42
53
45
Series
459
Threaded Safety Relief Valves Spring Loaded
Pressure Temperature Ratings US Units – Type 459 / 462
Pressure Temperature Ratings US Units1 – Type 459
Set Pressure Range
[psig]
Notes:
Orifice
[Inch2]
min.
0.044
0.099
0.206
0.373
150
21.8
2.9
2.9
1
2
3
max.
8550 (11600)3
5800
2900
1450
Temperature Range acc. to ASME
[°F]
min.
with bellows
–
43.5
43.5
43.5
Carbon Steel
SG Iron
Stainless Steel
min.
max.
min.
max.
min.
max.
- 20
+ 572
- 20
+ 800 2
- 300
+ 800 2
Stainless Steel
Heavy Duty Design
min.
max.
- 450 + 1000 2
for flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limits
above 572 °F / 300 °C stainless steel bellows is required for spring heat protection
value in brackets: special spring required, expect longer lead time
Pressure Temperature Ratings US Units1 – Type 462
Set Pressure Range
[psig]
Notes:
Orifice
[Inch2]
min.
max.
min.
with bellows
0.099
0.206
0.373
7.3
2.9
2.9
5075
2900
1450
43.5
43.5
43.5
1
2
46
Temperature Range acc. to ASME
[°F] 2
SG Iron
Carbon Steel
Stainless Steel
min.
max.
min.
max.
min.
max.
- 20
+ 356
- 20
+ 356
- 49
+ 356
for flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limits
the temperature is limited by the soft seal material, please refer to soft seal selection table on page 53
LWN 471.44
Threaded Safety Relief Valves Spring Loaded
Pressure Temperature Ratings Metric Units – Type 459 / 462
Pressure Temperature Ratings Metric Units1 – Type 459
Set Pressure Range
[bar]
Notes:
Orifice
[mm2]
min.
28.2
63.6
133
241
10
1.5
0.2
0.2
1
2
3
min.
with bellows
max.
590 (800)
400
200
100
Temperature Range acc. to ASME
[°C]
3
–
3
3
3
Carbon Steel
SG Iron
Stainless Steel
Stainless Steel
Heavy Duty Design
min.
max.
min.
max.
min.
max.
min.
max.
- 29
+ 300
- 29
+ 427 2
- 184
+ 427 2
- 268
+ 538 2
for flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limits
above 572 °F / 300 °C stainless steel bellows is required for spring heat protection
value in brackets: special spring required, expect longer lead time
Pressure Temperature Ratings Metric Units1 – Type 462
Set Pressure Range
[bar]
Notes:
Orifice
[mm2]
min.
max.
min.
with bellows
63.6
133
241
0.5
0.2
0.2
350
200
100
3
3
3
1
2
Temperature Range acc. to ASME
[°C] 2
SG Iron
Carbon Steel
Stainless Steel
min.
max.
min.
max.
min.
max.
- 29
+ 180
- 29
+ 180
- 45
+ 180
for flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limits
the temperature is limited by the soft seal material, please refer to soft seal selection table on page 53
LWN 471.45
47
Series
459
Threaded Safety Relief Valves Spring Loaded
Accessories and Options · Caps and Levers
Accessories and Options
Caps and Levers
Series 459 is available with the following lever designs
●
●
●
●
Cap H2
Plain lever H3
Packed lever H4
Test gag, available for cap H2 and
packed lever H4
Materials subassembly Item 40
Body Material
Carbon Steel or SG Iron
Body Material
Stainless Steel
Item
Component
Cap
H2
Plain Lever
H3
Packed Lever
H4
Cap
H2
Packed
Lever H4
1.1
2
3a
3b
4 / 1.4
1.5
6 / 1.6
1.7
1.8
1.9
1.9
1.10
1.10
1.11
12
13
14
22
23
24
25
93
93.5
Lever cover
Cap
Spacer
Hex screw
Shaft / Bolt
Lifting fork
Lever
Washer
Nut
O-ring
Bushing
Retaining clip
Nut
Support ring
Spindle cap
Pin
Retaining clip
Plug
Seal
Seal wire
Sealing nose
Test gag
Washer
–
Steel
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Plastic
316SS
316L
316SS
Fiber
Gr. 60-40-18
–
–
B7
Steel
Carbon Steel
Carbon Steel
Carbon Steel
–
–
–
Carbon Steel
–
–
Carbon Steel
316SS
316SS
Plastic
Plastic
316SS
–
–
–
Gr. 60-40-18
–
316L
–
Steel
Carbon Steel
Carbon Steel
Carbon Steel
2H
Viton
–
Carbon Steel
–
Carbon Steel
Carbon Steel
316SS
316SS
–
Plastic
316SS
–
316SS
Fiber
–
316L
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Plastic
316SS
316L
316SS
Fiber
CF8M
–
316L
–
316L
316L
316SS
316SS
8M
–
Graphite
–
316L
316SS
316L
316SS
316SS
–
Plastic
316SS
–
316SS
Fiber
12
2
14
6
25
13
3b
24
1
23
22
23
24
10
4
Cap H2
48
Plain lever H3
LWN 471.46
Threaded Safety Relief Valves Spring Loaded
Accessories and Options · Caps and Levers
93
93.5
1
12
14
13
1.5
1.6
24
23
3a
1.8
1.7
BLOCKED.
Remove after
testing!
1.10
1.11
1.9
1.4
Packed lever H4
LWN 471.47
Test gag
49
Series
459
Threaded Safety Relief Valves Spring Loaded
Accessories and Options · Balanced Bellows
Balanced Bellows
Application
Bellows protect the guides, moving
parts and the spring from dirt, corrosion, impurities or temperature to guarantee the proper function of the safety
relief valve. Additionally they provide
for back pressure compensation 1.
Materials and Limits of Application
Standard
Heavy Duty
Hastelloy®
Inconel®
Bellows material
Bellows joint materials
316L
316L
316L
316L
Hastelloy® C
Hastelloy® C
Inconel®
Inconel®
Option codes
J78
J78 + J55
J81
(Hastelloy®)
J78 + S15
(Inconel®)
Minimum
set pressure limit
43.5 psig
580 psig
Maximum
set pressure limit
580 psig
acc. to set
pressure limit
of the valve
Superimposed
back pressure limit 3
232 psig
580 psig
Design
Series 459 with balanced bellows is
provided with a bonnet spacer to
house the bellows. The spacer serves
for cooling and shields the bellows
against turbulences during discharge
to avoid vibration and to guarantee
longer lifetime.
Note s:
Built up
back pressure limit 3
max. 35 % of set pressure, not to exceed
the maximum bellows back pressure limit
Temperature limits
(Type 459)
up to 752 °F
The bellows for type 459/462 is back pressure compensating for orifice size 0.206 Inch2
(133 mm2). It is over compensating for orifice size 0.099 Inch2 (63,6 mm2) and under compensating
for orifice size 0.373 Inch2 (241 mm2). Please ask factory for details.
2 Type 4594 with heavy duty body: up to 1022 °F, the temperature limits for type 462 depend on
other parts e.g. soft seal materials.
3 The so called built up back pressure limit defines limit for which the proper function of the
pressure relief valve is ensured. The superimposed back pressure limit of a bellows refers only
to the static stability of the bellows design and does not consider the influence of the backpressure
on the opening and closing of a pressure relief valve.
1
Conversion kits are available for an
easy change from a conventional
design to a balanced bellows design.
Conversion kits contain all necessary
parts which must be replaced (bellows,
spacer, spindle and gaskets).
Please refer to page 56 Spare Parts.
50
LWN 471.48
Threaded Safety Relief Valves Spring Loaded
Accessories and Options · Metal Seat
Metal Seat (Type 459)
The LESER metal seats (disc and nozzle)
are lapped to optical flatness to ensure
a tight shut off. LESER safety relief
valves are supplied with a standard
leak tightness according to API 527.
Type 4592 / Type 4593
Standard material for the disc is a hardened stainless steel. The combination
of a hard disc material and a softer seat
material (316L) provides for improved
wear resistance and longer product life.
57
57
7.1
7.1
7.3
7.3
7.2
7.2
1
1
Type 4594
Disc and seat are provided in 316L
material for highest corrosion resistance. Any other material which is available from bar stock can be supplied as
Monel®,
well
(e.g.
Hastelloy®,
Alloy20,…).
Metal seat
Stellited sealing surfaces
Materials subassembly Item 7
Item
Part Name
Type 4593
Body Material
SG Iron
Type 4592
Body Material
Carbon Steel
Type 4594
Body Material
Stainless Steel
7.1
Disc
Hardened stainless steel
Hardness 40 – 50 HRC
Hardened stainless steel
Hardness 40 – 50 HRC
316L
7.2
7.3
57
Lifting aid
Retaining clip
Pin
316L
316L
316
316L
316L
316
316L
316L
316
Item
Part Name
Optional stellited sealing surfaces
7.1
Disc
316L stellited
Hardness 40 – 45 HRC
1
Inlet Body
316L stellited
Hardness 40 – 45 HRC
LWN 471.49
Discs with stellited sealing surfaces
For high temperature applications above
842 °F, or applications with abrasive
fluids wear resistant sealing surfaces
are recommended.
The sealing surfaces of the disc, seat
or nozzle can be stellited by build-upwelding. The minimum thickness of the
stellite is 0.06 inch.
In addition to the corrosion resistance,
the stellited surface also offers a high
resistance to impact and sudden
changes in temperature.
51
Series
459
Threaded Safety Relief Valves Spring Loaded
Accessories and Options · Soft Seal
Soft Seal
O-ring disc
(Type 462)
Disc with sealing plate (Type 459, optional)
Application
Type 459 and 462 are provided with a
soft seal disc for
● superior tightness
● maintained tightness close to the
set pressure
57
57
2
2
Features and Benefits
● two designs with o-ring or sealing
plate for extended application range
● minimized leakage and product loss
● large selection of soft seal materials
● simple replacement of soft seal
● standard ARP o-ring sizes
● reduced maintenance costs
● one standard durometer per o-ring
material
3
3
1
1
4
4
For temperature limits and medium
resistance refer to the soft seal selection table.
Disc with sealing plate Type 459
O-ring disc Type 462
Disc with sealing plate
For applications, where the increased
tightness of a soft seat seal is required
but the temperature is too low or too
high for an o-ring-disc, e.g. liquefied
gases.
Materials subassembly Item 7
Type 462
O-ring disc
Item
52
Type 459
Disc with sealing plate
Item
1
2
3
Part Name
Disc
Lifting aid
Pin
Material
316L
316L
316
1
2
3
Part Name
Disc
Lifting aid
Retaining clip
Material
316L
316L
316L
4
O-ring
Refer to soft seal
selection table
4
Sealing plate
Refer to soft seal
selection table
57
Pin
316
57
Pin
316
LWN 471.50
Threaded Safety Relief Valves Spring Loaded
Accessories and Options · Soft Seal
Soft Seal Selection
Designation
Trade name
Type 459 Sealing plate
Type 462 O-ring
Code
Code- Option
letter 1 Code
Tmax
Tmin
Application 2
[ °F]
[ °C]
[ °F]
[ °C]
CR
Neoprene®
(Chloroprene)
K
J21
-40
-40
212
100
Paraffin oil, silicone oil and grease, water and
waterbased solvents, refrigerants, ozone
NBR
Buna - N®
(Nitrile-Butadiene)
N
J30
-13
-25
230
110
Hydraulic oil, vegetable and animal grease
and oil
EPDM
Buna - EP®
(Ethylene-Propylene Diene)
D
J22
-49
-45
302
150
Hot water and superheated steam up to 302°F,
several organic and inorganic acids,
silicone oil and grease, FDA compliant
FPM
(FKM)
Viton®
(Fluorocarbon)
L
J23
-4
-20
356
180
For high temperature service (no superheated steam),
mineral oil and grease, silicone oil and grease, vegetable and animal grease and oil, ozone, FDA compliant
compound available on request
FFKM
Kalrez ®
(Perfluoro)
C
J20
32
0
482
250
Nearly all chemicals, standard compound is
Kalrez® 6375 with steam resistance, FDA compliant
compound available on request
SP
VESPEL SP-1® 1
(Polyimide)
T
J49
-454
-270
572
300
High temperature and high pressure applications
(no steam), for chemical resistance refer to
manufacturers guide
PCTFE
Kel-F®
(Polychlorotrifluoroethylene)
G
J48
-454
-270
400
204
Cryogenic and refrigeration application,
flammable media, gaseous oxygene application
up to 725 psig at 140 ºF
PTFE
Teflon®
(Polytetrafluoroethylene)
A
J44
-300
-184
302
150
Nearly all chemicals
Other
Notes:
1
2
Please contact LESER LLC
The code letters will be stamped on the retainer (Item 2). For soft seal materials other than listed the code letter X will be used.
Pressure and temperature service must be considered in any case.
Set Pressure Limits
Sealing plate disc
Pressure Range
min.
Material
VESPEL
SP-1®
Registered Trademarks
max.
[psig]
[bar]
[psig]
[bar]
150
10
5800
400
2.9
0.2
4350
300
Teflon®
2.9
0.2
145
10
LWN 471.51
Viton®, VESPEL SP-1®,
Neoprene®, Kalrez®
Kel-F®
Company
Teflon®,
Buna EP®
®
Kel-F
Buna-N®,
DuPont
Bayer
3M
53
Series
459
Threaded Safety Relief Valves Spring Loaded
Accessories and Options · Heating Jacket
Heating Jacket
Application
Pressure relief valves in systems to be
protected from media which are viscous, sticky or have a tendency to
crystallize out of solution can be fitted
with a heating jacket.
For type 459 the outlet body is fitted
with a fabricated heating jacket. The
position of the heating connections is
shown in the drawing.
Balanced Bellows Design
For safety relief valves with balanced
bellows, the bonnet spacer required to
house the bellows is fitted with an
additional heating jacket. Both heating
jackets are joined by a tubing.
Specifications of the heating jacket
The operating data for the heating jacket
are shown on a separate name plate.
Operating
Pressure
Operating
Temperatures
pmax
Tmax
260 psig
572 °F
Available heating connections
Type 459 with heating jacket
54
Connection
Option Code
Couplings FNPT
H29
LWN 471.52
Threaded Safety Relief Valves Spring Loaded
Accessories and Options · Lift Indicator
Lift Indicator
(proximity switch)
Lift indicators are an important component for automation. They are used to
monitor operating status.
As an option, Series 459 can be provided
with an inductive proximity switch.
The lift indicator will indicate an opening of the pressure relief valve when the
vessel pressure has increased so that
the valve opens with a “pop”.
LESER provides DC proximity switches
type “N” using two-wire technology.
These intrinsically safe proximity switches can be used in explosion hazard
area zone 0. Other types of switches
can be used as well.
B
A
94
The lift indicator option is available for
series 459 in combination with the
packed lever H4 either with or without
proximity switch.
The connection size is M18 x 1.
A = closed position
B = open position
LWN 471.53
Option
Option Code
Lifting device H4 with adaptor for lift indicator M18 x 1
J39
Lift indicator type PEPPERL + FUCHS NJ5-18GK-N
(5 V to 25 V d.c.)
J93
55
Series
459
Threaded Safety Relief Valves Spring Loaded
Spare Parts · Discs
Spare Parts
Discs – Type 459 metal to metal seat (Item 7)
Type 4594
316L
Orifice
[Inch2 ]
Type 4592 / 4593
Hardened stainless steel
0.044
–
0.099
200.2039.9000
200.2049.9000
0.206
200.2139.9000
200.2149.9000
0.373
200.2239.9000
200.2249.9000
Steam and gas service: 200.3269.9118
Liquid service:
200.3969.9118
Discs – Type 462 soft seal, disc material: 316L (Item 7)
Orifice
[Inch2 ]
O-ring size
ARP-no.
1
0.099
/2 x 3/32
ARP 112
9
0.206
/16 x 3/32
ARP 113
13
0.373
/16 x 3/32
ARP 117
CR
Neoprene
EPDM
Ethylene
FPM (FKM)
Viton®
NBR
Nitrile
FFKM
Kalrez®
K
D
L
N
C
200.9349.9051
200.9349.9041
200.9349.9071
200.9349.9081
200.9349.9091
200.4549.9051
200.4549.9041
200.4549.9071
200.4549.9081
On Request
200.4649.9051
200.4649.9041
200.4649.9071
200.4649.9081
On Request
CR
Neoprene
EPDM
Ethylene
FPM (FKM)
Viton®
NBR
Nitrile
FFKM
Kalrez®
K
D
L
N
C
502.0123.2651
502.0123.2641
502.0123.2671
502.0123.2681
502.0123.2691
502.0139.2651
502.0139.2641
502.0139.2671
502.0139.2681
On Request
502.0202.2651
502.0202.2641
502.0202.2671
502.0202.2681
On Request
O-ring – Type 462 soft seal (Item 7)
Orifice
[Inch2 ]
O-ring size
ARP-no.
1
0.099
3
/2 x /32
ARP 112
9
0.207
/16 x 3/32
ARP 113
13
0.373
56
/16 x 3/32
ARP 117
LWN 471.54
Threaded Safety Relief Valves Spring Loaded
Spare Parts · Inlet Bodies · Inlet Bodies and Flanges · Bellows · Gaskets
Inlet Bodies Type 459 / 462
Threaded connections – Material 316L (Item 1)
Male NPT
Orifice [Inch2 ]
Size
1 ”
/2
3 ”
/4
1”
3 ”
/4
1”
11/2”
3 ”
/4
1”
11/2”
1”
11/2”
Female NPT
Inlet Body
136.6969.9204
136.7069.9204
136.7169.9204
136.7549.9204
0.044
0.099
136.7649.9204
136.7849.9204
136.8049.9204
0.206
136.8149.9204
136.8349.9204
136.3649.9204
0.373
Size
1 ”
/2
3 ”
/4
1”
3 ”
/4
1”
11/2”
3 ”
/4
1”
11/2”
1”
11/2”
136.8649.9204
Orifice [Inch2 ]
0.044
0.099
0.206
0.373
Inlet Body
136.6969.9211
136.7069.9211
136.7169.9211
136.7549.9211
136.7649.9211
136.7849.9211
136.8049.9211
136.8149.9211
136.8349.9211
136.3649.9211
136.8649.9211
Bellows and Bellows Conversion Kits –
Material 316L (Item 15)
Note:
Valve Size
Set pressure
Bellows
Conversion Kit
all1
p ≤ 580 psig (40 bar)
400.7949.0000
5021.1050
all1
p > 580 psig (40 bar)
400.6349.0000
5021.1051
1
The bellows for type 459 / 462 is back pressure compensating for orifice size 0.206 In2 (133 mm2).
Gaskets Body – Bonnet (Item 60)
Valve Size
Gasket
Material
all
500.2407.0000
Graphite + 316 SS
all
500.2405.0000
Gylon (filled PTFE)
LWN 471.55
57
Series
459
Threaded Safety Relief Valves Spring Loaded
Approvals Series 459
Approvals Series 459
Coefficient of Discharge1
Country
Code
Type
Fluid
Approval No.
Orifice
ASME
Certified
K
ASME
Measured
KD
United
States
ASME Sec. VIII
459 / 462
S/G
L
37112
37101
All
All
0.811
0.566
0.901
0.629
Canada
CRN
459 / 462
S/G/L
OG0730.9C
All
Refer to ASME-code
Country
Code
Type
Fluid
Approval No.
Orifice
Certified Coefficient of Discharge
K dr
S/G
L
Europe
PED 97/23/EC
(CE-marking)
459 / 462
S/G
L
S/G
L
0.044
072020111
Z0008/0/13
S/G
L
0.099
0.206
0.373
0.81
0.70
0.83
0.61
0.81
0.53 2
0.79
0.52
αw
S/G
L
Germany
Others
Note:
58
AD 2000Merkblatt A2
China:
Russia:
Ship classification authorities:
459 / 462
S/G
L
S/G
L
0.044
0.099
TUEV-SV 909
S/G
L
SELO / AQSIQ (SQLBPV)
DIN GOST
0.206
0.373
0.81
0.70
0.83
0.61
0.81
0.53 2
0.79
0.52
BV, DNV, GL, LROS, RINA
Acc. to ASME Sec. VIII the certified coefficient of discharge K is calculated by K = 0.9 * KD
For sizing acc. to ASME Sec. VIII K must be used in the sizing equations.
2 Type 462: K
dr = 0.61 / α w = 0.61
1
LWN 471.56
Threaded Safety Relief Valves Spring Loaded
Capacities US Units / Metric Units · STEAM
Type 459 / 462
STEAM
STEAM
ASME Section VIII
[lb/ hr]
ASME Section VIII
[kg / hr]
Capacities US Units
Capacities Metric Units
Orifice
[Inch2 ]
Set pressure
[psig]
15
20
30
40
50
60
70
80
90
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
2000
2500
Orifice
[mm2 ]
0.044
0.099
0.206
0.373
349
389
430
470
510
550
591
631
671
711
752
792
832
1034
1235
1436
1638
1839
2040
2242
2443
2644
2842
3062
4233
5602
155
196
242
287
332
377
423
468
513
604
695
785
876
966
1057
1148
1238
1329
1419
1510
1601
1691
1782
1872
2326
2779
3232
3685
4138
4591
5044
5497
5950
6394
6889
9525
12604
281
324
410
504
599
693
788
882
977
1071
1260
1449
1638
1827
2016
2205
2394
2584
2773
2962
3151
3340
3529
3718
3907
4852
5797
6742
7688
8633
9578
10523
11469
12414
13340
14373
19872
26298
509
586
742
913
1085
1256
1427
1599
1770
1941
2284
2626
2969
3311
3654
3996
4339
4682
5024
5367
5709
6052
6394
6737
7080
8792
10505
12218
13931
15644
17357
19070
20782
22495
24174
Set pressure
[bar]
1
2
3
4
5
6
7
8
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
28.2
63.3
133
241
145
171
198
224
251
277
304
330
357
383
410
436
463
489
516
542
675
807
940
1072
1205
1340
1487
1638
1794
1956
2126
2305
2496
2701
2926
3176
87
117
147
176
206
236
266
296
326
385
445
505
564
624
683
743
803
862
922
982
1041
1101
1161
1220
1518
1817
2115
2413
2711
3015
3345
3685
4036
4401
4783
5186
5615
6077
6583
7146
125
182
244
306
368
430
493
555
617
679
804
928
1053
1177
1301
1426
1550
1675
1799
1924
2048
2173
2297
2421
2546
3168
3790
4412
5035
5657
6290
6978
7687
8421
9183
9980
10821
11716
12680
13734
14909
227
330
442
555
667
780
893
1005
1118
1231
1456
1682
1907
2133
2358
2584
2809
3035
3260
3486
3711
3937
4162
4388
4613
5741
6868
7996
9123
10251
11398
Capacities for saturated steam according to ASME Section VIII (UV), based on set pressure plus 10 % overpressure.
Capacities at 30 psig (2.07 bar) and bellow are based on 3 psig (0.207 bar) overpressure.
LWN 471.57
59
Series
459
Threaded Safety Relief Valves Spring Loaded
Capacities US Units / Metric Units · AIR
Type 459 / 462
AIR
AIR
ASME Section VIII
[S.C.F.M.]
ASME Section VIII
[Sm3/ hr]
Capacities US Units
Capacities Metric Units
Orifice
[Inch2 ]
Set pressure
[psig]
15
20
30
40
50
60
70
80
90
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
2000
2500
3000
3500
4000
4500
5000
6000
7000
8000
9000
10000
11000
0.044
125
139
154
168
182
197
211
226
240
254
269
283
298
370
442
514
586
658
730
802
874
946
1018
1090
1450
1810
2170
2530
2890
3250
3610
4330
5050
5770
6490
7211
7931
0.099
55
70
86
103
119
135
151
167
184
216
248
281
313
346
378
410
443
475
508
540
572
605
637
670
832
994
1156
1318
1480
1642
1804
1966
2128
2290
2452
3262
4072
4882
5692
6502
7313
8123
Orifice
[mm2 ]
0.206
0.373
100
115
146
180
213
247
281
315
348
382
449
517
584
652
719
787
854
921
989
1056
1124
1191
1259
1326
1393
1731
2068
2405
2742
3079
3416
3753
4091
4428
4765
5102
6788
8473
181
209
264
326
387
448
509
570
631
692
814
936
1058
1180
1302
1424
1546
1669
1791
1913
2035
2157
2279
2401
2523
3134
3744
4354
4965
5575
6186
6796
7407
8017
8628
Set pressure
[bar]
1
2
3
4
5
6
7
8
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
250
300
350
400
500
600
700
800
28.2
194
229
265
300
336
371
407
442
478
513
549
585
620
656
691
727
904
1082
1259
1437
1614
1792
1969
2147
2325
2502
2680
2857
3035
3212
3390
3568
4455
5343
6231
7119
8894
10670
12446
14221
63.3
117
157
196
236
276
316
356
396
436
516
596
676
756
836
916
996
1075
1155
1235
1315
1395
1475
1555
1635
2034
2434
2833
3233
3632
4032
4431
4831
5230
5630
6029
6429
6828
7228
7627
8027
10024
12022
14020
16017
133
241
168
243
326
409
492
575
658
741
825
908
1074
1240
1406
1573
1739
1905
2071
2238
2404
2570
2737
2903
3069
3235
3402
4233
5064
5895
6727
7558
8389
9221
10052
10883
11715
12546
13377
14209
15040
15871
16702
303
440
590
740
891
1041
1192
1342
1493
1643
1944
2246
2547
2848
3149
3450
3751
4052
4353
4654
4955
5256
5557
5858
6159
7664
9170
10675
12180
13685
15190
Capacities for air according to ASME Section VIII (UV), based on set pressure plus 10 % overpressure at 60 °F (16 °C).
Capacities at 30 psig (2.07 bar) and below are based on 3 psig (0.207 bar) overpressure.
60
LWN 471.58
Threaded Safety Relief Valves Spring Loaded
Capacities US Units / Metric Units · WATER
Type 459 / 462
WATER
WATER
ASME Section VIII
[US - G.P.M.]
ASME Section VIII
[103 kg/ hr]
Capacities US Units
Capacities Metric Units
Orifice
[Inch2 ]
Set pressure
[psig]
15
20
30
40
50
60
70
80
90
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
2000
2500
3000
3500
4000
4500
5000
6000
7000
8000
9000
10000
11000
0.044
12.5
13.3
14.0
14.7
15.4
16.0
16.6
17.2
17.7
18.3
18.8
19.3
19.8
22.2
24.3
26.2
28.0
29.7
31.3
32.9
34.3
35.7
37.1
38.4
44.3
49.6
54.3
58.6
62.7
66.5
70.1
76.8
82.9
88.6
94.0
99.1
104
0.099
10.2
12.2
14.1
15.8
17.3
18.7
19.9
21.2
22.3
24.4
26.4
28.2
29.9
31.5
33.1
34.5
36.0
37.3
38.6
39.9
41.1
42.3
43.5
44.6
49.9
54.6
59.0
63.1
66.9
70.5
74.0
77.2
80.4
83.4
86.4
99.7
111
122
132
141
150
158
Orifice
[mm2 ]
0.206
0.373
18.8
21.2
25.4
29.3
32.8
35.9
38.8
41.5
44.0
46.4
50.8
54.9
58.7
62.3
65.6
68.8
71.9
74.8
77.6
80.4
83.0
85.6
88.0
90.5
92.8
104
114
123
131
139
147
154
161
167
174
180
208
232
34.0
38.4
46.0
53.1
59.4
65.1
70.3
75.1
79.7
84.0
92.0
99.4
106
113
119
125
130
135
141
146
150
155
159
164
168
188
206
222
238
252
266
279
291
303
314
Set pressure
[bar]
1
2
3
4
5
6
7
8
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
250
300
350
400
500
600
700
800
28.2
2.71
2.97
3.21
3.43
3.64
3.83
4.02
4.20
4.37
4.53
4.69
4.85
5.00
5.14
5.28
5.42
6.06
6.64
7.17
7.67
8.13
8.57
8.99
9.39
9.77
10.1
10.5
10.8
11.2
11.5
11.8
12.1
13.6
14.8
16.0
17.1
19.2
21.0
22.7
24.2
63.3
2.73
3.34
3.86
4.31
4.72
5.1
5.45
5.78
6.1
6.68
7.22
7.71
8.18
8.62
9.04
9.45
9.83
10.2
10.6
10.9
11.2
11.6
11.9
12.2
13.6
14.9
16.1
17.2
18.3
19.3
20.2
21.1
22.0
22.8
23.6
24.4
25.1
25.9
26.6
27.3
30.5
33.4
36.1
38.6
133
241
4.20
5.68
6.95
8.02
8.97
9.83
10.6
11.3
12.0
12.7
13.9
15.0
16.0
17.0
17.9
18.8
19.7
20.5
21.2
22.0
22.7
23.4
24.1
24.7
25.4
28.4
31.1
33.6
35.9
38.1
40.1
42.1
44.0
45.7
47.5
49.1
50.8
52.3
53.8
55.3
56.7
7.61
10.3
12.6
14.5
16.2
17.8
19.2
20.5
21.8
23.0
25.2
27.2
29.1
30.8
32.5
34.1
35.6
37.0
38.4
39.8
41.1
42.4
43.6
44.8
45.9
51.4
56.3
60.8
65.0
68.9
72.7
Capacities for water according to ASME Section VIII (UV), based on set pressure plus 10 % overpressure at 68 °F (20 °C).
Capacities at 30 psig (2.07 bar) and below are based on 3 psig (0.207 bar) overpressure.
LWN 471.59
61
Series
459
Threaded Safety Relief Valves Spring Loaded
Specification Sheet
636 326 9185
Please fax to:
or your local representative
Specification Sheet
Company:
Phone:
Location:
Fax:
Name:
e-mail:
Reference:
Date:
GENERAL
1 ■ Item No.:
2 ■ Tag No.:
3 ■ Customer:
4 ● Equipment:
5 ● Enquiry/Order No.:
6 ● Delivery time:
7 ● Number of valves:
8 ● Number of spare valves:
9 ■ Basis of Selection: Code:
■ PED 97/ 23 / EC (CE-marking)
■ Two phase flow
■ other:
10 ■ Documentation: Material test report
■ inlet body
■ outlet body
■ bonnet:
■ other:
SERVICE CONDITIONS
11 ■ Fluid and state:
■ Steam (S)
12 ■ Molecular weight:
13 ● Coefficient C:
14 ● Ratio of specific heats k:
15 ● Compressibility factor Z:
16 ■ Spec. gravity / units:
17 ● Viscosity / units:
18 ■ Relieving temperature / units:
19 ■ Required capacity / units:
VALVE CONSTRUCTION
27 ● Orifice Designation:
28 ● Connection inlet
29 ● Size:
30 ● Thread type or Flange class:
31 ● Facing type: ■ RF
■ RJ
20
21
22
23
24
25
26
Gas (G)
■ Liquid (L)
Set pressure / units:
Operating pressure / units:
Cold diff. set pressure / units:
Const. back pressure / units:
Var. back pressure / units:
Overpressure:
■ 10 %
Blowdown:
■ 10 %
■ 3: SG Iron
38 ● Soft seat ■ CR ■ NBR
seal:
■ FPM ■ FFKM
39 ● Bellows: ■ 316L
■ Inconel®
40 ● Spring: ■ high temp. alloy
■ stainless steel
41 ● Comply with NACE MR 0175
ACCESSORIES AND OPTIONS
42 ■ Lifting lever: ■ plain H3 ■ packed H4 ■ cap H2
43 ● Test gag:
■ yes
■ no
44 ● Bellows: ■ yes
45 ● Others (specify):
SIZING AND SELECTION
46 ▲ Required orifice area / units:
47 ▲ Selected orifice area / units:
48 ▲ Coeff. of discharge:
49 ▲ Calculated capacity / units:
Order Code
of
■ ASME VIII
■ Fire
■ Two phase
■ ...... %
■ 20 %
■ ...... %
■ other:
■ 4: Stainless steel
■ EPDM
■ other:
■ Hastelloy®
■ other:
steel ■ carbon steel
■ other:
■ Yes
■ No
■ no
■ Please fill in these fields in any case.
● Please fill in these fields if possible.
▲ These fields will be completed by the supplier.
.
Article No.
62
■
■
●
●
■
■
●
●
Connection outlet
Size:
Thread type or Flange class:
Facing type:
■ RF
■ RJ
■ other:
MATERIALS
32 ● LESER Material Code
■ 2: Carbon Steel
33 ● LESER Type ■ 459
■ 462
34 ■ Inlet Body:
35 ● Outlet Body:
36 ● Bonnet:
37 ● Disc (metal): ■ SS hardened
■ 316L
■ other:
4
Page:
Set Pressure
Connections
Options
Documentation
Code and Medium
LWN 471.60
First in safety …
… a not so brief history of LESER
History
Safe solutions from the
specialist
Where to find LESER
The company started in 1818 as a
brass foundry and over the decades
developed a product portfolio of components for mechanical equipment and
machines during the “industrial revolution”. At first LESER specialized on
tough applications and its level gauges
for steam boilers were famous. Soon,
the company delivered their first safety
valve and as a consequence of quick
growing industrialization and improving
demand for safety, LESER rapidly
became the specialist for safety valves.
Today, LESER´s product range includes
23 different designs with a variety of
materials and sizes from 1/2” to 16”,
providing safe solutions for almost
every application with
● Full lift safety valves
● High-pressure safety valves
● Safety valves according to API 526
● Relief and safety relief valves
● Clean service safety relief valves
● Safety valves for critical service conditions
● Safety valves according to special
standards and regulation
● Safety valves with supplementary
pneumatic load
● Special versions
Headquartered in Germany, with a
state-of-the-art factory and more than
290 employees, LESER is present
through subsidiaries and qualified partners in over 40 countries, providing
products and services worldwide.
Type 441
For the nearest source please contact
us at:
LESER LLC
1664 Headland Drive
Fenton, MO 63026
Phone: 636 - 343 - 8766
Fax:
636 - 326 - 9185
e-mail: sales@leserusa.com
www.leserusa.com
Type 459
Type 437
Type 526
LESER’s factory today
Type 488
LESER Headquarter
1818 – 1914
Compact Performance Catalog
Edition July 2005
LWN 471.01-471.60 / 07.2005 / 3000
The Safety Valve
LESER LLC
1664 Headland Drive
Fenton, MO 63026
Phone: 636 - 343 - 8766
636 - 326 - 9185
Fax:
e-mail: sales@leserusa.com
www.leserusa.com