The definition of a valve is a device used to control the orientation, working pressure, and total flow of a fluid in a fluid system. The valve is a device that makes the medium (liquid, vapor, powder) fluid or terminate in the pipeline and machine equipment, and can control its total flow.
The valve is a control component in the pipeline fluid transportation system. It is used to change the cross-section of the channel and the fluidity of the medium. It has the functions of drainage, cut-off, adjustment, throttle, check, separation or overflow, and pressure relief. Valves used for fluid control, from the simplest shut-off valve to a variety of valves used in extremely complicated automatic control systems, have a variety of types and specifications, and the nominal diameter of the valve ranges from a tiny instrument valve. Valves for industrial production pipelines up to 10m in diameter. The valve can be used to control the fluidity of various types of fluids, such as water, steam, refined oil, gas, mortar, various corrosive media, shape memory alloys, and radioactive material fluids. The pressure of the valve can be from 0.0013MPa to 1000MPa high pressure, and the operating temperature ranges from the maximum temperature of -269 °C to the continuous high temperature of 1430 °C. Valve control can use a variety of transmission system methods, such as manual, electric, hydraulic valve, pneumatic, worm gear, electromagnetic induction, electromagnetic hydraulic valve, hydraulic push rod, hydropneumatic, spur gear, Spur bevel gear push, etc.; under the effect of working pressure, ambient temperature or other sensor data signals, it can be started or shut down simply according to the set posture, or without relying on sensor data signals, the valve is driven by pushing Or the fully automatic organization makes the opening and closing parts adjust, move, swing or rotate for fitness, and then change the size of the total area of the flow channel to achieve its control effect.
