Valve is a device used to control the direction, pressure and flow of the fluid in the fluid system. The valve is the piping and equipment within the media (liquid, gas, powder) device can control the flow and the flow or stop. Valve can be used to control the air, water, steam, all kinds of corrosive media, mud, oil, liquid metal and radioactive media, and other types of fluid flow.
Valve is a pipeline fluid conveying system control unit, which is used to change the flow direction of the channel section and the media, with diversion, stop, throttle, check, diversion or overflow relief and other functions. For fluid control valves, from the simplest to the most complex automatic control system used in a variety of valves, the variety and specifications, the valve nominal diameter from a very small instrument valve to the through diameter of 10m industrial pipeline with a valve. Valves can be used to control the flow of water, steam, oil, gas, mud, all kinds of corrosive medium, liquid metal and radioactive fluid and other types of fluid flow, the work pressure of the valve can be from 0.0013MPa to 1000MPa of ultra-high pressure, operating temperature from -269 degrees to 1430. The valve can be controlled by a variety of modes of transmission, such as manual, electric, hydraulic, pneumatic, turbine, pneumatic solenoid, solenoid hydraulic, electric hydraulic, pneumatic and hydraulic, spur gear, bevel gear drive, under pressure, temperature or other forms of sensor signal, according to the requirements of the scheduled action, or does not rely on the sensing signal and a simple open or closed valve to rely on drive or automatic mechanism to open and close parts for lifting, slip swing or rotary motion, thus changing the area of the channel size in order to achieve its control function.
