Valve (Valve) is a flow control flow of fluid medium, flow, pressure, temperature and other mechanical means, the valve is substantially piping system components. Valves, fittings and pumps are technically the same, often as a separate category for discussion. Gas fittings, faucets are the most common simple valve. The manual valve or handwheel, handle or pedal operation, can also be changed by controlling the pressure of the fluid medium, temperature and flow changes. The valve can be continuous or repetitive operations on these changes, such as hot water or steam boiler system installed safety valve. In a more complex control system in accordance with an external input (i.e., adjustment through the pipe changing set point) require the use of automatic control valves. Automatic control valves without manual operation according to the input and set the valve requires precise control of the fluid medium. Definition: in the fluid system for controlling the direction of the fluid, the pressure means, flow. The pipe and the valve is medium (liquid, gas, powder) within the apparatus and to stop the flow or the flow of the control device. Good work that can be used to control the flow of air valves, water, steam, corrosive media, mud, oil, liquid metals and radioactive fluids and other types of media. The valve is in the pipeline fluid delivery system control unit, which is used to change the channel section and flow direction of media, with diversion, closing the throttle, check, diversion or overflow relief functions. For fluid control valves, valves shut-off valve from the simplest to the most complex automatic control system used in its many varieties and specifications, the valve nominal diameter from large to tiny instrument valve diameter up to 10m industrial piping valves. Ultrahigh-pressure valve can be used to control the water, steam, oil, gas, mud, a variety of corrosive media, liquid metals and radioactive fluids and other types of fluid flow, the valve working pressure from 0.0013MPa to 1000MPa, the working temperature From ultra-low temperature -269 ℃ to 1430 ℃ in. Control valves can drive a variety of ways, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic move, electromagnetic hydraulic, electro-hydraulic, pneumatic and hydraulic, spur gears, bevel gear drive, etc; in pressure, temperature or under the influence of other forms of sensor signals, according to the requirements prescribed action, or do not rely on a simple sensor signal to open or close the valve being driven or automatic mechanism to make opening and closing pieces for lifting, sliding, swing or spin rotation movement, thereby changing the size of the flow passage area in order to achieve its control function. 

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