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Valves are generally divided into automatic valves and actuated valves. Automatic valves (such as safety valves, pressure reducing valves, steam traps, check valves) are dependent on the change of device or pipeline medium pressure to achieve the purpose of opening and closing. Driven valves (gate valves, globe valves, ball valves, butterfly valves, etc.) rely on driving devices (manual, electric, hydraulic, pneumatic, etc.) to regulate the pressure, flow and direction of the medium in the pipeline.

Due to the different pressure, temperature, flow and physical and chemical properties of the medium, the control requirements and use requirements of the device and pipeline system are also different, so the role of the valve are also different.

LoRa electric butterfly valve

This classification method is divided both by principle, role and structure, which is the current domestic, commonly used classification method. Generally divided into: gate valve, globe valve, plug valve, ball valve, butterfly valve, diaphragm valve, check valve, throttle valve, safety valve, pressure reducing valve, trap, regulating valve.

Classified by the role of the valve:

① cut-off valve: cut-off valve, also known as closed-circuit valve, its role is to connect or cut off the medium in the pipeline. Cut-off valves include gate valves, globe valves, plug valves, ball valves, butterfly valves and diaphragm valves.

② regulating valves: regulating valves include regulating valves, throttle valves and pressure reducing valves, whose role is to adjust the pressure of the medium, flow and other parameters.

③ check valve: check valve is also known as a one-way valve or check valve, its role is to prevent the backflow of media in the pipeline. Water pump suction off the bottom valve also belongs to the check valve category.

④Safety valve: the role of safety valves is to prevent the pipeline or device in the medium pressure exceeds the specified value, so as to achieve the purpose of safety protection.

⑤ Diverter valves: diverter valves include a variety of distribution valves and traps, etc., whose role is to distribute, separate or mix the media in the pipeline.

⑥Exhaust valves: Exhaust valves are essential auxiliary components in pipeline systems, often installed at high points or elbows, etc., to eliminate excess gas in the pipeline, improve the efficiency of the pipeline road and reduce energy consumption.

Classification by main parameters

①Vacuum valve The valve whose working pressure is lower than the standard atmospheric pressure.

②Low pressure valves Valves with nominal pressure PN<1.6MPa.

③Medium pressure valve Valve with nominal pressure PN<2.5~6.4Mpa.

④High-pressure valves Valves with nominal pressure PN10.0~80.0Mpa.

⑤ ultra-high pressure valve Nominal pressure PN≥100Mpa valve.

Classification by medium working temperature

①High temperature valve t>450℃ valve.

② medium temperature valve 120 ℃ ≤ t < 450 ℃ valve.

③ room temperature valve -40℃≤t<120℃ valve.

④Low temperature valve -100℃≤t<-40℃ valve.

⑤ ultra-low temperature valve t<-100℃ valve.

Classification by valve body material

① non-metallic material valves such as ceramic valves, glass steel valves, plastic valves.

② metal material valves such as copper alloy valves, aluminum alloy valves, lead alloy valves, titanium alloy valves iron valves, carbon steel valves, low-alloy steel valves, high-alloy steel valves.

③ metal body lined valves such as lead lined valves, plastic lined valves, enamel lined valves.