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℃.