The suitable medium temperature for different valve body and valve cover materials is as follows:
Gray cast iron valve body, valve cover suitable medium maximum operating temperature is 250℃.
Malleable cast iron valve body, valve cover suitable medium maximum service temperature is 300℃.
Ductile iron valve body, valve cover suitable medium maximum service temperature is 350℃.
High silicon cast iron valve body, valve cover suitable medium maximum operating temperature is 120℃.
Carbon steel valve body, valve cover suitable medium maximum operating temperature is 425℃ (forgings 16Mn, 30Mn up to 450℃).
The maximum service temperature of Cr5Mo alloy steel valve body and bonnet is 550℃.
1Cr18Ni9Ti and Cr18Ni12Mo2Ti stainless steel valve body, valve cover suitable medium maximum service temperature is 600℃.
Copper alloy valve body, valve cover suitable medium maximum service temperature is 200℃.
The maximum service temperature of titanium valve body and valve cover is 300℃.
Plastic valve body, valve cover for the highest use of the medium temperature: nylon 100℃, chlorinated polyether 100℃, PVC 60℃, polytrifluoroethylene -60~120℃, PTFE -180~150℃.
Rubber diaphragm valve depending on the type of rubber, natural rubber 60℃; Nitrile butadiene rubber, neoprene rubber 80℃; Fluorine rubber 150℃.
When rubber and plastic are used in the valve lining, the temperature resistance of rubber and plastic shall prevail.
Ceramic and glass valves, its temperature resistance is poor, generally used below 90℃.
Enamel valve temperature resistance is limited by the sealing ring material, the highest medium temperature exceeds 150℃.