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Definition and function of 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 within the medium (liquid, gas, powder) flow or stop and can control the flow of the device.

The valve is the control component in the pipeline fluid transportation system. It is used to change the passage section and the flow direction of the medium, and has the functions of diversion, cut-off, throttling, check, diversion or overflow and pressure relief. Used for fluid control valves, from the most simple valve to a very complex automatic control system used in a variety of valves, its variety and specifications, the nominal diameter of the valve from the very small instrument valve to the diameter of 10m industrial pipeline valve. It 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 0.0013MPa to 1000MPa ultra-high pressure, and the working temperature can be from -270 ℃ ultra-low temperature to 1430 ℃ high temperature.

The valve can be controlled by a variety of transmission methods, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electromagnetic, electro-hydraulic, pneumatic, spur gear, bevel gear drive, etc.; it can be driven by pressure, temperature or Under the action of other forms of sensing signals, it can act according to predetermined requirements, or simply open or close without relying on sensing signals, the valve relies on the drive or automatic mechanism to make the opening and closing parts lift, slide, swing or rotary movement, thereby changing the size of its flow area to achieve its control function.