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Common valve definition

Definition: A device used to control the direction, pressure, and flow of a fluid in a fluid system. The valve is a device that allows the flow or stop of the medium (liquid, gas, powder) in the piping and equipment and can control its flow.

The valve is the control component in the pipeline fluid delivery system. It is used to change the path section and the direction of the medium flow, and has the functions of diversion, cut-off, throttling, non-return, diversion, or pressure relief. Valves for fluid control, ranging from the simplest stop valve to various valves used in highly complex automatic control systems, are available in a wide range of sizes and sizes. The valve's nominal diameter ranges from extremely small gauge valves up to 10m in diameter. Industrial pipeline valves. The valve can be used to control the flow of various types of fluids such as water, steam, oil, gas, mud, various corrosive media, liquid metals, and radioactive fluids. The working pressure of the valve can be from ultra high pressure of 0.0013MPa to 1000MPa, working temperature From -269 °C ultra-low temperature to 1430 °C high temperature. The control of the valve can use a variety of transmission methods, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electro-hydraulic, electro-hydraulic, gas-liquid, spur, bevel gear drive, etc.; can be in pressure, temperature Or other forms of sensory signals, operate according to predetermined requirements, or simply open or close independent of the sensing signal, the valve relies on a drive or automatic mechanism to make the opening and closing parts move up, down, swing, swing or turn Movement, thereby changing the size of its flow area to achieve its control function.

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