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Control systems Pressure reducing/surplussing valves
Pressure/temperature limits
A
B
D
Steam saturation curve
F
G
E
C
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.
Use the high temperature DP143H version in this region.
A-D-E Flanged EN 1092, PN40, ANSI 300 and BS 10 Table J. A-B-C Flanged ANSI 150. F-G DP143G limited to 120 °C @ 26 bar g.
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 Yellow 0.2 to 3.0 bar g (DP143Y only)
4.6 94
Body design conditions
PN40
A-B-C
18.9 bar g @ 20 °C
Maximum design pressure
A-D-E
Limited to 26 bar g
Maximum design temperature
350 °C @ 24 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
DP143
300 °C @ 26 bar g
DP143G
Maximum operating temperature
120 °C @ 26 bar g
DP143H
350 °C @ 24 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-P006-01 CTLS Issue 16
Page 2 of 12
DP143, DP143G, DP143H and DP143Y Pilot Operated Pressure Reducing Valves with Cast Steel Bodies
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