Different body, cover material for the medium temperature is what?

Different body, bonnet material suitable for the following media temperature: gray cast iron body, the valve cover for the highest temperature of 250 â„ƒ. Malleable cast iron body, valve cover for the highest temperature of 300 â„ƒ. Ductile iron body, valve cover for the highest temperature of 350 â„ƒ. High silicon cast iron valve body, valve cover for the highest temperature of 120 â„ƒ. Carbon steel valve body, valve cover for the highest temperature of 425 â„ƒ (forging 16Mn, 30Mn up to 450 â„ƒ). Cr5Mo alloy steel body, valve cover for the highest temperature of 1550 â„ƒ. 1Cr18Ni9Ti and Cr18Ni12Mo2Ti stainless steel valve body, valve cover for the highest temperature of 600 â„ƒ. Copper alloy valve body, valve cover for the highest temperature of 200 â„ƒ. Titanium body, the valve cover for the highest temperature of 300 â„ƒ. Plastic body, the valve cover suitable medium Maximum temperature: nylon 100 â„ƒ, chlorinated polyether 100 â„ƒ, polyvinyl chloride 60 â„ƒ, polychlorotrifluoroethylene -60 ~ 120 â„ƒ, polytetrafluoroethylene -180 ~ 150 â„ƒ . Rubber diaphragm valve depending on the type of rubber may be different, natural rubber 60 â„ƒ; nitrile rubber, neoprene 80 â„ƒ; Viton 150 â„ƒ. Valve lining with rubber, plastic, to rubber, plastic temperature resistance shall prevail. Ceramic and glass valves, the rapid change of temperature, generally used below 90 â„ƒ. Enamel valve temperature resistance by the sealing material, the maximum medium temperature exceeds 150 â„ƒ.