Valve classification methods

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The general classification method classifies items based on both principles and functions as well as structure; it is currently the most widely used classification method internationally and domestically. They generally include gate valves, globe valves, throttle valves, control valves, plug valves, diaphragm valves, cock valves, ball valves, butterfly valves, check valves, pressure reducing valves, safety valves, steam traps, control valves, foot valves, filters, and drain valves. Classified by purpose and function: Control valves – mainly used to regulate the flow rate, pressure, etc. of the medium. Including control valves, throttle valves, pressure relief valves, etc. Check valves – used to prevent the backflow of fluid. Including check valves of various structures. Shunt valves – used to separate, distribute, or mix media. Including distribution valves and steam traps of various structures, etc. Safety valves – used for safety protection when the pressure of the medium exceeds a certain level. Including various types of safety valves. Shut-off valves – mainly used to shut off or connect the flow of a medium. These include gate valves, globe valves, diaphragm valves, ball valves, plug valves, disc valves, plunger valves, ball plug valves, and needle-type control valves. Classified by pressure: Vacuum valves – valves that operate at pressures below standard atmospheric pressure. Low-pressure valve – a valve with a nominal pressure PN of less than 1.6 MPa. Medium-pressure valves – valves with a nominal pressure of PN 2.5–6.4 MPa. High-pressure valve – valves with a nominal pressure of PN10.0–80.0 MPa. Ultra-high pressure valves – valves with a nominal pressure PN greater than 100 MPa. Classified by medium temperature: High-temperature valves – valves with a temperature t greater than 450°C. . Medium-temperature valve — a valve for temperatures between -120°C and 450°C. Normal temperature valves – valves for temperatures ranging from 40°C to less than 120°C. Low-temperature valve – a valve for temperatures where 100°C < t < -40°C. Ultra-low temperature valves – valves for temperatures below -100°C. Classified by valve body material: Metal valve body lined valves – lead-lined valves, plastic-lined valves, enamel-lined valves. Non-metallic material valves – such as ceramic valves, fiberglass-reinforced plastic valves, and plastic valves. Metallic 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, and high-alloy steel valves.