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The applicable medium temperature for valve materials
2024.08.06
The applicable medium temperature for different valve body and bonnet materials is as follows:
The grey cast iron body and bonnet are suitable for media temperatures up to 250°C.
The malleable cast iron body and bonnet are suitable for media with a maximum service temperature of 300°C.
The ductile iron body and bonnet are suitable for the medium with a maximum service temperature of 350°C.
The high-silicon cast iron body and bonnet are suitable for the medium with a maximum operating temperature of 120°C.
The carbon steel body and bonnet are suitable for the medium with a maximum service temperature of 425°C (forgings 16Mn, 30Mn up to 450°C).
The Cr5Mo alloy steel body and bonnet are suitable for the medium with a maximum service temperature of 550°C.
1Cr18Ni9Ti and Cr18Ni12Mo2Ti stainless steel body and bonnet are suitable for media use temperatures up to 600°C.
The copper alloy body and bonnet are suitable for the medium with a maximum service temperature of 200°C.
The titanium body and bonnet are suitable for the medium with a maximum service temperature of 300°C.
The maximum operating temperature of the medium suitable for plastic valve body and bonnet is: nylon 100°C, chlorinated polyether 100°C, PVC 60°C, PVC -60~120°C, PTFE -180~150°C.
Rubber diaphragm valve depends on the type of rubber, natural rubber 60°C; Nitrile, neoprene 80°C; Viton 150°C.
When rubber and plastic are used for valve lining, the temperature resistance of rubber and plastic shall prevail.
Ceramic and glass valves, which have poor resistance to temperature abrupt changes, are generally used below 90°C.
The temperature resistance of the enamel valve is limited by the sealing ring material, which exceeds 150°C at the maximum medium temperature.
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