Brief introduction of valve

Brief introduction of valve

Valve is a device used to control the direction, pressure and flow rate of fluid in a fluid system. It is a device that makes the medium (liquid, gas, powder) in the piping and equipment flow or stops and can control its flow rate.

Valve is the control part of pipeline fluid transportation system, which is used to change the channel section and medium flow direction, and has the functions of diversion, cutoff, throttling, check, shunt or overflow pressure relief. Valves for fluid control, from the simplest globe valves to the various valves used in extremely complex automatic control systems, have a wide variety and specifications, with nominal diameters ranging from very small instrument valves to industrial pipeline valves with a diameter of up to 10 m. It can be used to control the flow of various types of fluid, such as water, steam, oil, gas, mud, various corrosive media, liquid metal and radioactive fluid. The working pressure of the valve can be from 0.0. The working temperature from 013MPa to 1000MPa can be from super low temperature of c-270 ℃ to high temperature of 1430 ℃.

Valve control can be used in a variety of transmission modes, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electro-hydraulic, pneumatic, spur gear, bevel gear drive and so on; Under the action of pressure, temperature or other forms of sensing signal, the valve can be opened or closed simply according to the predetermined requirements, or does not rely on the sensing signal. The valve can make the opening and closing parts lift, slip, swing or rotate under the action of pressure, temperature or other forms of sensing signal, so as to change the size of the channel area to realize its control function.

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