in valve design or use experience, lift Industrial Valves packing for asbestos packing ptfe or graphite packing or v-shaped packing, but these packing are subject to the limit the number of the Industrial Valves opening and closing, is with the increase of valve opening and closing times, packing will wear and clearance increases gradually, to a certain number of times ( According to statistics, no more than 2000 times) The valve will be leaked from the packing. Leak after need new compression packing gland. The scheme is suitable for the valve opening and closing times of the few occasions.

if the valve opening and closing of the 'frequent, ( As in 10 - opening and closing 300000 times) , which definitely add to the use and maintenance cost of the Industrial Valves.

is there a that the valve opening and closing - 100 Can be sealed after 2 million cycles and still design? The answer is yes.

a way to add a gasket at the bottom of the packing, in here to add a spring gasket ( Spring pre-tightening force calculation) , due to the effect of spring, when packing wear will compress packing again, make its seal. This method by using the test at present, only reach 50 - opening and closing Don't leak it 1 million times, you need to use the party at the annual overhaul, to compress the packing gland, can only reduce the usual maintenance.

another way, is the selection of hydraulic and pneumatic sealing technique, changing the original valve design train of thought, the use of cylinder sealing slip ring packing place, adding 0 type sealing ring ( Need to calculate the friction, the sealing pressure, to determine the slip ring and a sealing ring the number of) 。 By using this method, can reach the open-close don't leak it 2 million times, but the 0 type sealing ring to aging, use the time to have 5 years only, at the same time the high cost.

key words: the service life of the valve packing method
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