Fixed orifices Flow measuring orifice

MDFO
Fixed orifices
Flow measuring orifice
IMI TA / Balancing valves / MDFO
MDFO
Flow measuring orifice with self-sealed measuring points.
Key features
>> Self-sealing measuring points
For simple, accurate balancing.
>> Stainless steel
Guarantees a longer lifetime.
Technical description
Application:
Heating and cooling systems
Tapwater systems
Temperature:
Max. working temperature: 120°C
Min. working temperature: -20°C
Function:
Measuring
Material:
Fixed orifice: Stainless steel
X3CrNiMo17-13-3 (No. 1.4436 according
to EN 10028-7 or EN 10272 (BS 970
316/S16)
Measuring points: AMETAL®
Sealing (measuring points): EPDM
Dimensions:
DN 20-900
Pressure class:
PN 16 (DN 20-900)
PN 25 (DN 65-300)
PN 40 (DN 65-450)
AMETAL® is the dezincification resistant
alloy of IMI Hydronic Engineering.
General
Wafer pattern orifice for fixing between
EN 1092, ISO 7005 (BS 4504) flanges.
The measuring orifice fulfils the
requirements of BS 1042: Section
1.1:1992 (ISO 5167-1:1991).
The calculation of flow rates are
according to BS 1042: Section 1.4:1992.
2
Measuring points
MDFO (52 176 and 52 276) with
extended self-sealed measuring points.
Marking:
TA, MDFO, DN, PN, Charge No, flow
direction arrow.
DN 20-150 (PN 16): BS 7350.
Installation
Before you install the measuring orifice, check that:
- it is clean and undamaged.
- the surfaces that are to seal against are clean and undamaged.
- there is enough straight pipe lengths before and after the
measuring orifice.
10 D
5D
The measuring orifice should be installed betweeen two counter
flanges. Check that these counter flanges are parallel and that
the gaskets are according to given standard for flanges. Check
also that the measuring orifice and the gaskets are correctly
centred before tightening.
Differential pressure measurement should take place with
extreme care especially if this concerns hot media.
Pressure switch and thermostat
In order to guarantee the lowest and highest pressure as well
as to ensure that the temperature is not exceeded the system
should be fitted with a pressure switch and thermostat.
Commissioning
Test the pressure on the valve using cold water.
Tighten the flange joints and check for leakage in connection
with commissioning.
Maintenance
The measuring orifice MDFO are maintenance free under the
condition that they are used within their normal application area.
Articles
With self-sealed measuring points
95
H
PN 16
D
DN
D
H
20
25
32
40
50
65
80
100
125
150
200
250
300
350
400
450
500
600
700
750
800
900
63
73
84
94
109
127
142
162
192
218
273
329
384
444
496
556
618
735
805
865
911
1011
127
131
137
142
150
159
166
176
191
204
231
260
287
317
343
373
404
463
498
528
551
601
Flange
thickness
Kvmax
Kvsignal
Kg
EAN
Article No
18
18
18
18
18
18
18
18
18
18
18
18
18
20
23
28
28
29
31
32
32
33
6
11
23
35
72
154
220
373
570
789
1383
2122
3116
4000
5300
6400
7950
10700
15000
17500
20300
26000
4,68
8,64
16,6
24,5
46,1
90
120
220
342
468
792
1224
1800
2250
3000
3750
4500
6500
9000
10500
12000
15500
0,59
0,70
0,83
0,98
1,2
1,5
1,8
2,0
2,5
3,0
4,3
5,7
7,0
10
14
22
26
43
44
51
56
65
7318792808203
7318792808302
7318792808401
7318792808500
7318792808609
7318792808708
7318792808807
7318792808906
7318792809002
7318792809101
7318792809200
7318792809309
7318792809408
7318792809507
7318792809606
7318793777904
7318792809705
7318793805102
7318793805201
7318793966001
7318793805300
7318793805409
52 176-920
52 176-925
52 176-932
52 176-940
52 176-950
52 176-965
52 176-980
52 176-990
52 176-991
52 176-992
52 176-993
52 176-994
52 176-995
52 176-996
52 176-997
52 176-999
52 176-998
52 276-001
52 276-002
52 276-012
52 276-003
52 276-004
3
IMI TA / Balancing valves / MDFO
PN 25
95
H
D
DN
D
H
65
80
100
125
150
200
250
300
127
142
168
194
224
284
340
400
159
166
179
192
207
237
265
295
DN
D
H
65
80
100
125
150
200
250
300
350
400
450
127
142
168
194
224
290
352
417
474
546
571
159
166
179
192
207
240
271
304
332
368
381
Flange
thickness
Kvmax
Kvsignal
Kg
EAN
Article No
18
18
18
18
18
18
18
18
154
220
373
570
789
1383
2122
3116
90
120
220
342
468
792
1224
1800
1,5
1,8
2,0
2,5
3,0
4,3
5,7
7,0
7318793783103
7318793783202
7318793783301
7318793783400
7318793783509
7318793783608
7318793783707
7318793783806
52 176-865
52 176-880
52 176-890
52 176-891
52 176-892
52 176-893
52 176-894
52 176-895
Flange
thickness
Kvmax
Kvsignal
Kg
EAN
Article No
18
18
18
18
18
18
18
18
20
23
28
154
220
373
570
789
1383
2122
3116
4000
5300
6400
90
120
220
342
468
792
1224
1800
2250
3000
3750
1,5
1,8
2,0
2,5
3,0
4,3
5,7
7,0
15,0
23,0
26,0
7318793782304
7318793782403
7318793782502
7318793782601
7318793782700
7318793782809
7318793782908
7318793783004
7318793955302
7318793955401
7318793955906
52 176-765
52 176-780
52 176-790
52 176-791
52 176-792
52 176-793
52 176-794
52 176-795
52 176-796
52 176-797
52 176-798
PN 40
Accessories
-009
Measuring points
Max 120°C (intermittent 150°C)
-609
L
d
L
d
L
EAN
Article No
1/4
1/4
39
103
7318792813108
7318792814600
52 179-009
52 179-609
extended
d
The products, texts, photographs, graphics and diagrams in this document may be subject to
alteration by IMI Hydronic Engineering without prior notice or reasons being given. For the most up
to date information about our products and specifications, please visit www.imi-hydronic.com.
5-30-5 MDFO 09.2014