Audo Look6.0 downloadPressure-relief valve is a kind of special unit that reduces pipeline actuating pressure automatically, it but the pipeline before a powerful person taller hydraulic the level that reduces to need to place of the pipeline after a powerful person. Pressure-relief valve is used extensively at service pipe of high-level building, city circumstance of etc of the area with hydraulic and exorbitant net, mine, obtain proper service in order to make sure each use water site in water supply system hydraulic with discharge. The hydraulic size that loses rate and wasteful degree to be the same as water supply system almost in view of the leakage of water becomes direct ratio, because this pressure-relief valve is had,improve systematic operating conditions and function of potential section water, according to statistic effect of its section water is 30 ％ about.
The tectonic type of pressure-relief valve is very much, have filmy type with what see as one used to do, inside bedspring piston. The main effect principle of pressure-relief valve is the flow path inside ＊ a powerful person is reduced to the local resistance of current hydraulic, hydraulic falling limits by the film of valve of join a powerful person or piston the saliva of pass in and out of two side presses difference self-adjusting. Appear again in recent years a few new-style pressure-relief valve, if decide the pressure-relief valve that compare style, if its construction principle pursues 14. 2 - 2 are shown. Compare the water pressure ratio that decompression principle is piston of the float in using system of a powerful person to control surely, end of imports and exports decreases pressure ratio and area ratio of piston of side of imports and exports to become inverse ratio. Job of this kind of pressure-relief valve does not have vibration smoothly; Bedspring is not had inside body of a powerful person, reason does not have bedspring the Lv of invalidation of fatigue of rustily, metal; Sealed performance is good not leakage, reduce dynamic pressure already consequently (when current is moved) decrease again static pressure (discharge is 0 when) ; Be in especially decompression while do not affect discharge.
Pressure-relief valve has a variety of norms such as DN50 ～ DN100 normally, before a powerful person, the actuating pressure after is mixed for ＜ 1MPa respectively 0. 1 ～ 0. 5MPa, pressure regulating limits error is ±5 ％ ～ 10 ％ .
Should see, although have very big head loss,current passes pressure-relief valve, but because reduced the waste of water to make system flow rate distributings reasonable, improved systematic layout and operating mode, because this is told on the whole,still be energy-saving.
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