44
Control systems Pressure reducing/surplussing valves
Pressure / temperature limits
Materials
B
D
A
C
1
Steam saturation curve
E H
H
4
G
F
3
Pressure bar g
The product must not be used in this region.
A-D-E Flanged EN 1092 PN25 A-C-G Flanged EN 1092 PN16 A-B-F Flanged ASME 150. H-H The DRV7G is limited to 90 °C
2
Body design conditions
PN25
Maximum design pressure
25 bar g @ 100 °C
DRV7
300 °C @ 17.5 bar g
Maximum design temperature
DRV7G
90 °C @ 25 bar g
4.6 48
Minimum design temperature
0 °C
DRV7
300 °C @ 17.5 bar g
Maximum operating temperature
DRV7G
90 °C @ 25 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 38 bar g Note : With internals fitted, test pressure must not exceed 25 bar g
DN25
No. Part
Material
DN15 to DN50 SG iron
DIN 1693 GGG 40.3
Body
1
DN65 to DN100 SG iron
ENG JS 400-18-LT
Bonnet
SG iron
DIN 1693 GGG 40.3
2 3
Valve seat
Stainless steel
BS 970 431 S29
DN15
Stainless steel
Valve seat gasket
DN20 and DN25 Mild steel DN32 to DN50 Reinforced exfoiliated graphite
4
TI-P204-01 CTLS Issue 15
Page 2 of 10
DRV7 and DRV7G SG Iron Pressure Reducing Valves
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