What is the applicable medium temperature for different valve body and bonnet materials?

                  Column:Technical article Time:2020-07-17
                  The highest service temperature of applicable medium for gray iron valve body and bonnet is 250℃;Malleable iron body, valve cover applicable medium maximum service temperature is 300℃

                  The applicable medium temperature for different valve body and bonnet materials is as follows:

                  The maximum medium temperature for gray cast iron body and bonnet is 250℃.

                  Malleable iron body, valve cover applicable medium maximum service temperature is 300℃.

                  Ductile iron valve body, bonnet suitable for the medium maximum temperature of 350℃.

                  High silicon cast iron body, bonnet suitable for the medium maximum temperature of 120℃.

                  The highest service temperature for carbon steel valve body and bonnet is 425℃ (forgings 16Mn and 30Mn up to 450℃).

                  Cr5Mo alloy steel body, valve cover suitable for the medium maximum temperature of 550℃.

                  1Cr18Ni9Ti and Cr18Ni12Mo2Ti stainless steel body and bonnet suitable for the medium maximum temperature of 600℃.

                  Copper alloy valve body, bonnet suitable for the medium maximum temperature of 200℃.

                  Titanium valve body, valve cover applicable medium maximum temperature is 300℃.

                  The highest temperature of the medium suitable for plastic valve body and bonnet: nylon 100℃, chlorinated polyether 100℃, POLYvinyl chloride 60℃, polytrifluoroethylene -60~120℃, polytetrafluoroethylene -180~150℃.

                  Rubber diaphragm valve depends on different types of rubber, natural rubber 60℃;Nitrile butadiene rubber, neoprene 80℃;Fluororubber 150℃.

                  Valve lining with rubber, plastic, rubber, plastic temperature resistance shall prevail.

                  Ceramic and glass valves, their temperature resistance and rapid change difference, generally used below 90℃.

                  Enamel valve temperature resistance is limited by seal ring materials, the highest temperature of the medium over 150℃.


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