What is the classification of valve materials?
There are hundreds of valve materials, but only half are commonly used. The following is the classification of commonly used materials：
1.Ductile iron. Suitable for PN≤4.0MPa, temperature -30 ~ 350℃ water, steam, air and oil.
2.Carbon steel. Suitable for water, steam, air, hydrogen, ammonia, nitrogen and petroleum products with nominal pressure PN≤32.0MPa and temperature -30 ~ 425℃.
3.Malleable cast iron. Suitable for water, steam, air and oil with nominal pressure PN≤2.5mpa and temperature -30 ~ 300℃.
4.Gray cast iron. Suitable for nominal pressure PN≤1.0mpa, temperature -10℃~ 200℃ water, steam, air, gas, oil, etc.
5.Copper alloy. Suitable for PN≤ 2.5mpa water, seawater, oxygen, air, oil and other media, as well as the temperature of -40 ~ 250℃ steam medium.
6.Acid resistant high silicon ductile iron. Suitable for corrosive media with nominal pressure PN≤0.25mpa and temperature below 120℃.
7.Stainless steel acid resistant steel. Suitable for nitric acid, acetic acid and other nominal pressure PN≤6.4mpa, temperature ≤200℃ medium.
8.Low temperature steel. Suitable for ethylene, propylene, liquefied natural gas, liquid nitrogen and other media with nominal pressure PN≤6.4mpa and temperature ≥196℃.
9.High temperature copper. Suitable for steam and petroleum products with nominal pressure PN≤17.0mpa and temperature ≤570℃.