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