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On the knowledge of valve classification
This classification method is divided according to the principle, function and structure, and is currently the most commonly used international and domestic classification method. General gate valve, globe valve, throttle valve, instrument valve, plunger valve, diaphragm valve, plug valve, ball valve, butterfly valve, check valve, pressure relief valve, safety valve, trap, regulating valve, foot valve, filter, Drain valve, etc.
Classified by purpose and function
Regulating valves-mainly used to adjust the flow and pressure of the medium. Including regulating valve, throttle valve, pressure reducing valve, etc.
Check valves-used to prevent the medium from flowing back. Includes check valves of various structures.
Shunt valves-used to separate, distribute or mix media. Including various structures of distribution valves and traps.
Safety valves-used for safety protection when the medium is overpressured. Including various types of safety valves.
Shut-off valves-mainly used to cut off or connect the medium flow. Including gate valves, globe valves, diaphragm valves, ball valves, plug valves, butterfly valves, plunger valves, ball plug valves, needle instrument valves, etc.
Classified by pressure
Vacuum valve-a valve whose working pressure is lower than the standard atmospheric pressure.
Low pressure valve-a valve whose nominal pressure PN is less than 1.6MPa.
Medium pressure valve-a valve with a nominal pressure of PN 2.5-6.4MPa.
High-pressure valve-a valve with a nominal pressure of PN10.0-80.0MPa.
Ultra-high pressure valve-a valve whose nominal pressure PN is greater than 100MPa.
Classified by medium temperature
High temperature valve-a valve with t greater than 450°C.
Medium temperature valve—a valve whose 120℃ is less than t and 450℃.
Normal temperature valve-40℃ less than t less than 120℃ valve.
Cryogenic valve-a valve whose 100℃ is less than t and -40℃.
Ultra-low temperature valve-a valve with t less than -100°C.
Classified by valve body material
Metal valve body lining valves—: lead-lined valves, plastic-lined valves, enamel-lined valves.
Non-metallic material valves-such as ceramic valves, glass fiber reinforced plastic valves, plastic valves.
Metal material valves-such as: copper alloy valves, aluminum alloy valves, lead alloy valves, titanium alloy valves, Monel alloy valves, cast iron valves, carbon steel valves, cast steel valves, low alloy steel valves, high alloy steel valves.