Basic Documentation
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Valve Body Rating
The temperature-pressure ratings for ANSI Classes 125 and 250 valve bodies made of bronze or cast iron are shown below.
Control Valve Sizing and Selection
Pressure
Description Temperature ANSI Class 125 ANSI Class 250
Bronze Screwed Bodies
Specication #B16.15-1978
ANSI Amer. Std.; USA; ASME
-20 to + 150°F (-30 to + 66°C) 200 psi (1378 kPa) 400 psi (2758 kPa)
-20 to + 200°F (-30 to + 93°C) 190 psi (1310 kPa) 385 psi (2655 kPa)
-20 to + 250°F (-30 to + 121°C) 180 psi (1241 kPa) 365 psi (2586 kPa)
-20 to + 300°F (-30 to + 149°C) 165 psi (1138 kPa) 335 psi (2300 kPa)
-20 to + 350°F (-30 to + 177°C) 150 psi (1034 kPa) 300 psi (2068 kPa)
-20 to + 400°F (-30 to + 204°C) 125 psi (862 kPa) 250 psi (1724 kPa)
Cast Iron Flanged Bodies
Class B-sizes 1 to 12
Specication #B16.1 1975
ANSI Amer. Std.; USA; ASME
-20 to + 150°F (-30 to + 66°C) 200 psi (1378 kPa) 500 psi (3445 kPa)
-20 to + 200°F (-30 to + 93°C) 190 psi (1310 kPa) 460 psi (3169 kPa)
-20 to + 225°F (-30 to + 106°C) 180 psi (1241 kPa) 440 psi (3032 kPa)
-20 to + 250°F (-30 to + 121°C) 175 psi (1206 kPa) 415 psi (2859 kPa)
-20 to + 275°F (-30 to + 135°C) 170 psi (1171 kPa) 395 psi (2722 kPa)
-20 to + 300°F (-30 to + 149°C) 165 psi (1138 kPa) 375 psi (2584 kPa)
-20 to + 325°F (-30 to + 163°C) 155 psi (1069 kPa) 355 psi (2448 kPa)
-20 to + 350°F (-30 to + 177°C) 150 psi (1034 kPa) 335 psi (2308 kPa)
-20 to + 375°F (-30 to + 191°C) 145 psi (1000 kPa) 315 psi (2170 kPa)
-20 to + 400°F (-30 to + 204°C) 140 psi (965 kPa) 290 psi (1998 kPa)
-20 to + 425°F (-30 to + 218°C) 130 psi (896 kPa) 270 psi (1860 kPa)
-20 to + 450°F (-30 to + 232°C) 125 psi (862 kPa) 250 psi (1734 kPa)