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What is the applicable temperature of the materials used for different valves?
The medium temperature for different valve body and valve cover materials is as follows:
The gray cast iron body and bonnet can be used up to a maximum temperature of 250°C.
The malleable cast iron body and bonnet can be used with a maximum service temperature of 300°C.
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The ductile cast iron body and cover can be used up to 350°C.
The maximum temperature of medium for high silicon cast iron body and bonnet is 120°C.
The maximum service temperature of the medium of the carbon steel valve body and bonnet is 425°C (16Mn for forgings and 450°C for 30Mn).
The maximum service temperature of the media for Cr5Mo alloy steel bodies and bonnets is 550°C.
1Cr18Ni9Ti and Cr18Ni12Mo2Ti stainless steel bodies and bonnets are suitable for applications up to 600°C.
Copper alloy valve body, bonnet suitable for the maximum temperature of 200 °C.
Titanium valve bodies and bonnets can be used up to 300°C.
The maximum service temperature of the plastic body and bonnet is: nylon 100°C, chlorinated polyether 100°C, polyvinyl chloride 60°C, polychlorotrifluoroethylene-60~120°C, polytetrafluoroethylene-180~150°C .
Different types of rubber, natural rubber 60 °C; nitrile rubber, neoprene 80 °C; fluorine rubber 150 ~ 200 °C.
Most high-vacuum valves use soft-sealed nitrile rubber or fluoroelastomer, which guarantees a zero-leakage standard for valves. The sealing performance is strong, but the temperature resistance is limited by the material of the seal ring. The maximum medium temperature cannot exceed 220°C.
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