Control systems Pressure reducing/surplussing valves
4
Pressure/temperature limits
B
C
A
Steam saturation curve
F
F
E
D
Pressure bar g
The product must not be used in this region.
A-C-D Flanged EN 1092 PN40 and ASME 300.
A-B-E Flanged ASME 150.
F-F The DRV4G is limited to 90 °C.
Body design conditions
PN40
Maximum design pressure
40 bar g @ 50 °C
DRV4
300 °C @ 25.8 bar g
Maximum design temperature
4.6 37
DRV4G
90 °C @ 37.3 bar g
Minimum design temperature
0 °C
DRV4
300 °C @ 25.8 bar g
Maximum operating temperature
DRV4G
90 °C @ 37.3 bar g
Minimum operating temperature Note: For lower operating temperatures consult Spirax Sarco
0 °C
DN15 - DN50
25 bar
Maximum differential pressure
DN65 - DN100
20 bar
Designed for a maximum cold hydraulic test pressure of
60 bar g
Note: With internals fitted, test pressure must not exceed
40 bar g
TI-P203-01 CTLS Issue 20
Page 3 of 15
DRV4 and DRV4G Cast Steel Pressure Reducing Valves
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