Definition of Valve

    “Valve"is defined in fluid systems, the device used to control the direction, pressure, flow rate of flow. Valve is the device to let media in the piping and equipment (liquid, gas, powder) flow or to stop and can control its flow.

    Valve is a control unit in a pipeline fluid transfer system, which is used to change the channel section and flow direction of medium, and has the diversion, close, regulating, throttling, just back, diversion or overflow relief functions. Valves for controling fluid, from the simplest valve to the most complex variety of valves used in automatic control system, has many varieties and specifications. Valve diameter size from tiny path instrument valve to industrial pipeline valves of path with 10m. Valve can be used to control water, steam, oil, gas, slurry, corrosive medium, the liquid metal and radioactive fluids and other types of fluid flow. Valve working pressure from 0.0013MPa to 1000MPa of high pressure, working temperature from -269 ℃ ultra-low temperature to 1430 ℃. Valve can be used a variety of transmission modes to control, such as manual, electric, hydraulic, pneumatic, worm, electromagnetic dynamic, electromagnetic - hydraulic, electro - hydraulic, gas - hydraulic, spur gears, bevel gear drive etc. It can be on or off according to the requirements of scheduled actions in pressure, temperature or other forms of sensor signals, , or do not rely on a simple sensor signals.Valve body rely on drivers or automatic to let power switch lifting, sliding, rotating pendulum, or rotary movement, thus changing the size of its flow area to achieve its control function.