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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 |
---|---|---|
-20~150 | 200 | 150 |
200 | 190 | 135 |
225 | 180 | 130 |
250 | 175 | 125 |
275 | 170 | 120 |
300 | 165 | 110 |
325 | 155 | 105 |
350 | 150 | 100 |
375 | 145 | - |
400 | 140 | - |
425 | 130 | - |
450 | 125 | - |
Temp. °F | NPS 2"~12" psi | NPS 14"~24" psi |
---|---|---|
-20~150 | 500 | 300 |
200 | 460 | 280 |
225 | 440 | 270 |
250 | 415 | 260 |
275 | 395 | 250 |
300 | 375 | 240 |
325 | 355 | 230 |
350 | 335 | 220 |
375 | 315 | 210 |
400 | 290 | 200 |
425 | 270 | - |
450 | 250 | - |
Temp. °F | Class 150 2"~24" psi | Class 300 2"~24" psi |
---|---|---|
-20~100 | 250 | 640 |
200 | 235 | 600 |
300 | 215 | 565 |
400 | 200 | 525 |
500 | 170 | 495 |
600 | 140 | 465 |
650 | 125 | 450 |
Temp. °F | Class 125 2"~12" psi | Class 125 14"~24" psi |
---|---|---|
-20~150 | 200 | 150 |
200 | 190 | 135 |
225 | 180 | 130 |
250 | 175 | 125 |
275 | 170 | 120 |
300 | 165 | 110 |
325 | 155 | 105 |
350 | 150 | 100 |
375 | 145 | - |
400 | 140 | - |
425 | 130 | - |
450 | 125 | - |
Temp. °F | Class 250 2"~12" psi | Class 250 14"~24" psi |
---|---|---|
-20~150 | 500 | 300 |
200 | 460 | 280 |
225 | 440 | 270 |
250 | 415 | 260 |
275 | 395 | 250 |
300 | 375 | 240 |
325 | 355 | 230 |
350 | 335 | 220 |
375 | 315 | 210 |
400 | 290 | 200 |
425 | 270 | - |
450 | 250 | - |