Working Temperature and Nominal Pressure Ranges of Common Materials for Valve Bodies
The working temperature and nominal pressure ranges of common materials for valve bodies are as follows:
- Gray cast iron is suitable for low pressure valves with a working temperature range of -15°C to +200°C and a nominal pressure PN ≤ 1.6 MPa.
- Malleable cast iron with black heart is suitable for medium and low pressure valves with a working temperature range of -15°C to +250°C and a nominal pressure PN ≤ 2.5 MPa.
- Ductile cast iron is suitable for medium and low pressure valves with a working temperature range of -30°C to +350°C and a nominal pressure PN ≤ 4.0 MPa.
- Carbon steel (WCA, WCB, WCC) is suitable for medium and high pressure valves with a working temperature range of -29°C to +425°C. Among them, 16Mn and 30Mn have a working temperature range of -40°C to +450°C and are often used to replace ASTM A105.
- Low-temperature carbon steel (LCB) is suitable for low temperature valves with a working temperature range of -46°C to +345°C.
- Alloy steel (WC6, WC9) is suitable for high temperature and high pressure valves in non-corrosive media with a working temperature range of -29°C to +595°C; WC5 and WC12 are suitable for high-temperature and high-pressure valves in corrosive media with a working temperature range of -29°C to +650°C.
- Austenitic stainless steel is suitable for valves in corrosive media with a working temperature range of -196°C to +600°C.
- Monel alloy is mainly suitable for valves in media containing hydrofluoric acid.
- Cast copper alloy is mainly suitable for valves used in oxygen pipelines with a working temperature range of -273°C to +200°C.
The above are the main categories of common materials for valve bodies. Specifically, there are many different grades within each material category, and each grade is suitable for different pressure levels. Therefore, when selecting the material for the valve body, the valve body material suitable for the working conditions should be determined according to different uses and pressure levels.
In addition, the materials for valve bodies also include titanium alloy (titanium valve), aluminum alloy (aluminum valve), plastic (plastic valve), ceramic (ceramic valve), and so on.
