Operating temperature and nominal pressure range of common materials of valve body:


1. Gray cast iron, suitable for low pressure valve with working temperature between - 15 ~ + 200 ℃, nominal pressure PN ≤ 1.6Mpa.


2. Black core malleable iron, suitable for medium and low pressure valves with working temperature of - 15 ~ + 250 ℃ and nominal pressure of PN ≤ 2.5MPa.


3. Ductile iron, suitable for medium and low pressure valves with working temperature of - 30 ~ + 350 ℃ and nominal pressure of PN ≤ 4.0Mpa.


4. Carbon steel (WCA, WCB, WCC) is suitable for medium and high pressure valves with operating temperature between - 29 ℃ and - 425 ℃, among which 16Mn and 30mn are used to replace astma105 with operating temperature between - 40 ℃ and + 450 ℃.


5. Low temperature carbon steel (LCB), suitable for low temperature valve with working temperature between - 46 ℃ and + 345 ℃.


6. Alloy steel (wc6, wc9) is suitable for high temperature and high pressure valve of non corrosive medium with working temperature of - 29 ~ + 595 ℃; wc5, wc12 are suitable for high temperature and high pressure valve of corrosive medium with working temperature of - 29 ~ + 650 ℃.


7. Austenitic stainless steel, suitable for valves with corrosive medium operating temperature between - 196 ℃ and + 600 ℃.


8. Monel alloy is mainly suitable for valves with hydrofluoride medium.


9. Cast copper alloy, mainly suitable for oxygen pipeline valves with working temperature between - 273 ℃ and + 200 ℃.


The above listed are the major categories of commonly used materials for valve body. In each specific category of materials, there are many different brands, which are applicable to different pressure grades. Therefore, when selecting the valve body material, the valve body material suitable for the working condition should be determined according to different purposes and different pressure levels.


In addition, the valve body materials include titanium alloy (titanium valve), aluminum alloy (aluminum valve), plastic (plastic valve), ceramic (ceramic valve), etc.