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Pressure-Temperature Ratings for Cast Iron Gate Valves

October 15, 2020

Metal seated cast iron gate valves (American standard) may be made of gray iron or ductile iron in accordance with MSS SP 70 and MSS SP 128, respectively. The gray iron shall be in accordance with ASTM A126, while the ductile iron shall be in accordance with ASTM A395 or ASTM A536. They are generally used for various non-shock applications and the pressure-temperature ratings are presented in the tables below.

Temp.
°F
Class 125
2"~12"
psi
Class 125
14"~24"
psi
-20~150200150
200190135
225180130
250175125
275170120
300165110
325155105
350150100
375145-
400140-
425130-
450125-
*Pressure-temperature ratings for Class 125, gray iron gate valves made of ASTM A126 Gr.B, abstracted from MSS SP 70.

Temp.
°F
NPS
2"~12"
psi
NPS
14"~24"
psi
-20~150500300
200460280
225440270
250415260
275395250
300375240
325355230
350335220
375315210
400290200
425270-
450250-
*Pressure-temperature ratings for Class 250, gray iron gate valves made of ASTM A126 Gr.B, abstracted from MSS SP 70.

Temp.
°F
Class 150
2"~24"
psi
Class 300
2"~24"
psi
-20~100250640
200235600
300215565
400200525
500170495
600140465
650125450
*Pressure-temperature ratings for Class 150 & Class 300, ductile iron gate valves made of ASTM A395, abstracted from MSS SP 128.

Temp.
°F
Class 125
2"~12"
psi
Class 125
14"~24"
psi
-20~150200150
200190135
225180130
250175125
275170120
300165110
325155105
350150100
375145-
400140-
425130-
450125-
*Pressure-temperature ratings for Class 125, ductile iron gate valves made of ASTM A536, abstracted from MSS SP 128.

Temp.
°F
Class 250
2"~12"
psi
Class 250
14"~24"
psi
-20~150500300
200460280
225440270
250415260
275395250
300375240
325355230
350335220
375315210
400290200
425270-
450250-
*Pressure-temperature ratings for Class 250, ductile iron gate valves made of ASTM A536, abstracted from MSS SP 128.

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