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℃.