44
Control systems Safety valves
Pressure/temperature limits
A C
Steam saturation curve
D
B
Pressure psi g
The product must not be used in this region.
A - B Limit for valves with a flanged inle C - D Limit for valves with a screwed inlet.
Body design conditions
ANSI 250
Maximum
250 psi g
Set pressure range
Minimum
5 psi g
Screwed inlet
406 °F
Maximum
Flanged inlet
446 °F
Temperature
4.7 98
Minimum
-20 °F
ASME I
Steam
3%
Overpressure
Steam
10%
ASME VIII
Air/gas
10%
ASME I
Steam
2 - 6%
Performance data
Blowdown limits
Steam
7%
ASME VIII
Air/gas
7%
Steam
0.955
Derated coefficient of discharge values
Air/gas
0.955
Maximum permitted backpressure up to:
10% of set pressure
Tested at a maximum inlet cold hydraulic test pressure of:
600 psi g
TI-S13-25 CTLS Issue 12
Page 2 of 8
SV73 Cast Iron Safety Valve
Powered by FlippingBook