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Small knowledge; medium temperature suitable for different valve body and bonnet materials
The applicable medium temperature for different valve body and bonnet materials is as follows:
Grey cast iron valve body and bonnet are suitable for medium maximum service temperature of 250℃.
Malleable cast iron valve body and bonnet are suitable for medium maximum service temperature of 300℃.
ductile iron valve body and bonnet are suitable for medium maximum operating temperature of 350℃.
High silicon cast iron valve body and bonnet are suitable for medium maximum operating temperature of 120℃.
Carbon steel valve body and bonnet are suitable for medium maximum service temperature of 425℃ (forgings 16Mn and 30Mn can reach 450℃).
Cr5Mo alloy steel valve body and bonnet are suitable for medium maximum service temperature of 1550℃.
1Cr18Ni9Ti and Cr18Ni12Mo2Ti stainless steel valve body and bonnet are suitable for medium maximum service temperature of 600℃.
Copper alloy valve body and bonnet are suitable for medium maximum service temperature of 200℃.
The maximum operating temperature of the medium suitable for the titanium valve body and bonnet is 300℃.
Plastic valve body and bonnet applicable medium maximum operating temperature: nylon 100℃, chlorinated polyether 100℃, polyvinyl chloride 60℃, polytrifluorochloroethylene -60~120℃, polytetrafluoroethylene-180 ~150℃.
Rubber diaphragm valve depends on the type of rubber, natural rubber 60℃; nitrile rubber, neoprene rubber 80℃; fluorine rubber 150℃.
When rubber or plastic is used for valve lining, the temperature resistance of rubber and plastic shall prevail.
Ceramic and glass valves have poor temperature resistance and are generally used below 90°C.
The temperature resistance of the enamel valve is limited by the material of the sealing ring, and the maximum medium temperature exceeds 150℃.
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