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What is the temperature of the bonnet medium of different valve bodies

Update:30-06-2021
Summary:

The maximum service temperature of the medium suitable […]

The maximum service temperature of the medium suitable for gray cast iron valve body and bonnet is 250℃.

The maximum operating temperature of the medium applicable to the malleable cast iron valve body and bonnet is 300°C.

The maximum operating temperature of the medium suitable for ductile iron valve body and bonnet is 350℃.

High silicon cast iron valve body and bonnet are suitable for medium maximum operating temperature of 120℃.

The maximum operating temperature of the medium suitable for carbon steel valve body and bonnet is 425°C (forgings 16Mn and 30Mn can reach 450°C).

The maximum service temperature of Cr5Mo alloy steel valve body and bonnet is 550℃.

1Cr18Ni9Ti and Cr18Ni12Mo2Ti stainless steel valve bodies and bonnets are suitable for medium maximum operating temperature of 600℃.

The maximum operating temperature of the medium suitable for copper alloy valve body and bonnet is 200℃.

The maximum operating temperature of the medium suitable for titanium valve body and valve cover is 300℃.

The maximum operating temperature of plastic valve body and bonnet suitable for medium: nylon 100℃, chlorinated polyether 100℃, polyvinyl chloride 60℃, polytrifluorochloroethylene -60~120℃, polytetrafluoroethylene -180~150℃ .

The rubber diaphragm valve depends on the type of rubber, natural rubber 60°C; nitrile rubber and neoprene rubber 80°C; fluorine rubber 150°C.

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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