Control valves

Pressure reducing/surplussing valves

E

4.6.65

Steam

saturation

curve

F

C

G

Pressure / temperature limits

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A

B

D

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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)

Body design conditions

Maximum design pressure

Maximum design temperature

Minimum design temperature

Maximum upstream pressure for saturated steam service

Maximum operating temperature

Minimum operating temperature

Note: For lower operating temperatures consult Spirax Sarco

Maximum differential pressure

Designed for a maximum cold hydraulic test pressure of:

Note: With internals fitted, test pressure must not exceed:

Pressure bar g

A-B-C

A-D-E

A-D-E

A-B-C

DP143

DP143G

DP143H

A-D-E

A-B-C

PN40

18.9 bar g @ 20 °C

Limited to 26 bar g

350 °C @ 24 bar g

0 °C

26 bar g

14 bar g

300 °C @ 26 bar g

120 °C @ 26 bar g

350 °C @ 24 bar g

0 °C

26 bar

14 bar

60 bar g

40 bar g

TI-P006-01 CH Issue 13

DP143, DP143G, DP143H and DP143Y Pilot Operated Pressure Reducing Valves with Cast Steel Bodies

Page 2 of 9

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