valve is liquid transportation system software of the control system, have ended, adjusting, drainage, avoid backflow, voltage regulator tube, separation or overflow pressure relief, and so on. Automatic control system for liquid valve, from the very simple cut-off valve to its multifarious automation control system software is commonly used in all kinds of valves, its types and specifications are very diverse.

in Industrial Valves design or application experience, see more filling material hoist valve asbestos packing or high purity graphite filler or ptfe v-shaped filling material, but this kind of filling material of the valve open and close frequency limit, is associated with the valve open and close frequency, filling material damage, space expand slowly, to a certain frequency ( According to the survey is not easy to more than 2000 times) The valve will be caused by leakage from the filling material. Leakage after should be the new clamping filling material screw cap. This kind of plan suitable valves open and close frequency very few places.

if the opening and closing of the valve frequency often, ( Is like an open closed five hundred thousand times) , which no doubt enhance the application of the valve, maintenance costs. Is there a kind of can be open and close the valve 100 - Can two million times, still can seal design scheme? The answer is no doubt about it.

a way to, in the period right ascension a seal, the sealing ring below add a play yellow ( Play yellow pre-tightening force must measure) , after filling material damage, because play the effect of yellow, will once again clamping filling material, make its sealing. This kind of method according to the application of detection at present stage, open and close 50 - only do One million don't leak, should be applied in every year maintenance, clamping stuffing screw cap again, only lower normal maintenance.

in addition a kind of method, is used hydraulic and pneumatic seal technology, changes the original valve design idea, in the applied electrical slip ring hydraulic cylinder sealing, filling material lift type O sealing ring ( Shall measure the sliding friction, sealing pressure, can clear electrical slip ring and the total number of type O sealing ring) 。 This kind of method according to the application, can do not leak, open and close two million times to brittle type O sealing ring, however, use only five years, additional cost is higher.

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