The valve stem bears t畫離ension, pressure and to機能rsion forces during the 吧人opening and closing of t紅線he valve, and is in direc雨朋t contact with the medium. At the same兒金 time, there is relative friction樂門al movement...
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(1) Lip fillerDue to the soft lip of th村還e lip filler, it will expand latera林飛lly and tightly adhere to the retain也去ing wall under the actio開樂n of the medium pressure. This expande好錢d filler can be used in co著林mp...
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1. The structure of com身器pressed packingMost co時章mpressed fillers use asbestos f黑技ibers as the base material becau影分se of the properties of asbestos. It i物購s basically not affected by most m年錢edia, temperature an...
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