3
FMPRV41
PMO-Maximum allowable pressure
17 bar g
TMO-Maximum allowable temperature
232°C
Cold hydraulic test pressure
34 bar g
Spring range
0.3 to 17 bar g
3.
Brief Product Information:
3.1
Description:
The Forbes Marshall Pilot Operated Forbes Marshall Pilot Operated Pressure Reducing Valve,
FMPRV41 is a SG iron pilot operated Forbes Marshall Pilot Operated Pressure Reducing Valve
suitable for steam or compressed air.
3.2
Sizes and End Connections:
DN 15, 20, 25, 40 and 50
Screwed: BSPT / NPT for DN 15, 20, 25
Flanged: BS 10 table “F/H” for DN 40 and 50
DN15 FMPRV41 LC versions available
3.3
Limiting Conditions:
3.4
Pressure Sensing Pipe:
The FMPRV41 controls the pressure by sensing the downstream pressure through a
pressure sending pipe taken to the union (item L ) or through the internal sensing pipe
(item M). Fitting of the external pressure sensing pipe is described in the user manual
supplied with the valve.Note: Capacity is reduced and there is a possibility of hunting if
an external pressure sensing pipe is not fitted.
3.5
Operating Range:
KV Values
The Kv values are full capacities and should be used for safety valve sizing purpose
only
SIZE
DN15
DN20
DN25
DN40
DN50
KV
2.8
5.5
8.1
17
28
For conversion Cv (UK)=Kv x 0.963
Cv (US)=Kv x 1.156
The product
must not
be used in this region.
Pressure bar g
T
emperature
°
C
A
E
Steam
saturation
curve
C
F
B
D
G
0
5
15
20
10
17
100
150
50
200
232
