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What is a valve?
Valve is in the fluid system, used to control the direction of the fluid, pressure, flow of the device, is to make the piping and equipment medium (liquid, gas, powder) flow or stop and can control the flow of the device.

The valve is the control part in the pipeline fluid transportation system, which is used to change the path section and medium flow direction, and has the functions of flow diversion, cut-off, throttle, check, shunt or overflow pressure relief. Valves used for fluid control, ranging from the simplest globe valves to the most complex automatic control systems, come in many varieties and specifications, with nominal sizes ranging from extremely small instrument valves to industrial piping valves with diameters up to 10m. Can be used to control the flow of water, steam, oil products, gas, mud, a variety of corrosive media, liquid metal and radioactive fluid and other types of fluid, the working pressure of the valve can be from 0.0013mpa to 1000MPa ultra-high pressure, the working temperature can be c-270℃ ultra-low temperature to 1430℃ high temperature.

Valve control can be used in a variety of transmission modes, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electromagnetic hydraulic, electro-hydraulic, gas-hydraulic, spur gear, bevel gear drive, etc. In pressure, temperature or other form under the action of sensor signals, action, according to the requirement of the reservation or not depend on the sensor signals for simple open or shut down, rely on the drive or automatic mechanism makes opening and closing valve for lifting, sliding, place or rotary movement, so as to change the size of the port in order to realize the control function.

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