Pressure rating of cast iron valves

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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.
°FClass 125
2"~12"
psiClass 125
14"~24"
psi -20~ - - - - *Pressure-temperature ratings for Class 125, gray iron gate valves made of ASTM A126 Gr.B, abstracted from MSS SP 70.

*Pressure-temperature ratings for Class 125, gray iron gate valves made of ASTM A126 Gr.B, abstracted from MSS SP 70.

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Temp.
°FNPS
2"~12"
psiNPS
14"~24"
psi -20~ - - *Pressure-temperature ratings for Class 250, gray iron gate valves made of ASTM A126 Gr.B, abstracted from MSS SP 70.

*Pressure-temperature ratings for Class 250, gray iron gate valves made of ASTM A126 Gr.B, abstracted from MSS SP 70.

Temp.
°FClass 150
2"~24"
psiClass 300
2"~24"
psi -20~ *Pressure-temperature ratings for Class 150 & Class 300, ductile iron gate valves made of ASTM A395, abstracted from MSS SP 128.

*Pressure-temperature ratings for Class 150 & Class 300, ductile iron gate valves made of ASTM A395, abstracted from MSS SP 128.

Temp.
°FClass 125
2"~12"
psiClass 125
14"~24"
psi -20~ - - - - *Pressure-temperature ratings for Class 125, ductile iron gate valves made of ASTM A536, abstracted from MSS SP 128.

*Pressure-temperature ratings for Class 125, ductile iron gate valves made of ASTM A536, abstracted from MSS SP 128.

Temp.
°FClass 250
2"~12"
psiClass 250
14"~24"
psi -20~ - - *Pressure-temperature ratings for Class 250, ductile iron gate valves made of ASTM A536, abstracted from MSS SP 128.

*Pressure-temperature ratings for Class 250, ductile iron gate valves made of ASTM A536, abstracted from MSS SP 128.

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