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Valve is the device of discharge of fluid of control of in order to, pressure and flow direction. Controlled fluid can be mixture body of mixture body of fluid of liquid, gas, gas or solid fluid. Valve is built by body of a powerful person, a powerful person normally, valve base, open shut, the composition such as actuating device, weather strip and fastener. The control function of valve is to rely on actuating device or fluid to drive open shut litre fall, slippage, come back to place or answer have a change of luck to move what will in order to change the size of flow path area come true. The use of valve is very extensive, the daily life of it and people has close relationship, for example the pressure-relief valve that kitchen of the faucet that self-invited conduit uses, liquefied petroleum gas uses is valve. If traffic of unit of internal-combustion engine, steamer, compressor, pump, baric gearing, fluid drive, shipping and aircraft are medium,valve also is all sorts of mechanical equipment indispensable component. BC before 2000, the Chinese was defeated by conduit to use bamboo canal and stopper a powerful person on the road, channel is irrigating to go up again after use clough, board type check valve is used on the bellows that smelt uses, in field of well salt mine use bamboo is in charge of and brine of extraction of board type check valve is mixed as smelt technology the development of hydraulic machinery, appeared in Europe copper is made and lead makes faucet valve. As the use of boiler, appeared again 1681 relief valve of type of lever heavy weight. Watt steamer appeared 1769 previously, faucet a powerful person and check valve are the mainest valve all the time. The invention of steamer makes valve entered machinist job field. Mix besides use faucet a powerful person, relief valve on the steamer of watt outside check valve, still used butterfly a powerful person, in order to moves section discharge. As the accretion of vapour discharge and pressure, already cannot satisfy need of steamer of control of use faucet a powerful person into steam and platoon steam, appeared then pilot valve.

-- news source: Always fine county limited company of Zheng Xu valve

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