The valve stem bears t這能ension, pressure and torsion fo黃司rces during the open的開ing and closing of the valve, and is i員北n direct contact with the mediu服厭m. At the same time, there兒門 is relative frictional mov西長ement...
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(1) Lip fillerDue to 大房the soft lip of the lip filler, 學章it will expand laterally and tigh技問tly adhere to the retaining wall under水到 the action of the me小微dium pressure. This expanded filler can子如 be used in comp...
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1. The structure of compre通錯ssed packingMost compress靜自ed fillers use asbestos fibers as th章姐e base material because of th呢章e properties of asbestos. It車筆 is basically not affected by most m睡窗edia, temperature an...
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