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Control systems Pressure reducing/surplussing valves
Pressure/temperature limits A
B
D
Steam saturation curve
C
E
Pressure bar g
The product must not be used in this region. Due to the material strength of the main diaphragm chamber the product must not be used in this region.
A-D-E Flanged EN 1092 PN40, ANSI 300 and BS 10 Table J. A-B-C Flanged ANSI 150.
Note: Two colour coded pressure adjustment springs are available for the following downstream pressure ranges: Red 0.2 bar g to 17 bar g Grey 16.0 bar g to 24 bar g
Body design conditions
PN40
A-B-C
17.2 bar g @ 40 °C
4.6 130
Maximum design pressure
A-D-E
Limited to 26 bar g
Maximum design temperature
300 °C @ 26 bar g
Minimum design temperature
0 °C
A-D-E
26 bar g
Maximum upstream pressure for saturated steam service
A-B-C
14 bar g
Maximum operating temperature
300 °C @ 26 bar g
Minimum operating temperature Note: For lower operating temperatures consult Spirax Sarco
0 °C
A-D-E
26 bar
Maximum differential pressure
A-B-C
14 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-P004-01 CTLS Issue 8
Page 2 of 12
SDP143 Pilot Operated Pressure Surplussing Valve with Cast Steel Body
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