Introduction to basic knowledge of valves
Valves are devices used to control the direction, pressure, and flow of fluids in fluid systems. They are devices that make the medium (liquid, gas, powder) in pipes and equipment flow or stop and control its flow.
Valves are control components in pipeline fluid delivery systems. They are used to change the cross-section of the passage and the flow direction of the medium. They have functions such as diversion, cutoff, throttling, check, diversion, or overflow pressure relief. Valves used for fluid control, from simple stop valves to various valves used in extremely complex automatic control systems, have a wide variety of varieties and specifications. The nominal diameter of valves ranges from extremely small instrument valves to industrial pipeline valves with a diameter of 10m. 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 range from 0.0013MPa to 1000MPa of ultra-high pressure, and the working temperature can range from ultra-low temperature of c-270℃ to high temperature of 1430℃.
The valve can be controlled by a variety of transmission methods, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electromagnetic hydraulic, electro-hydraulic, gas-hydraulic, spur gear, bevel gear drive, etc.; it can act according to predetermined requirements under the action of pressure, temperature or other forms of sensor signals, or simply open or close without relying on sensor signals. The valve relies on a drive or automatic mechanism to make the opening and closing parts move up and down, slide, swing or rotate, thereby changing the size of its flow area to achieve its control function.
