While medium pressure and the upstream end of the resilient and flexible structures to increase the downstream end of the valve seat seal.

同时介质压力与上游端挠性结构的回弹力又增加了下游端阀座的密封。

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While medium pressure and the upstream end of the resilient and flexible structures to increase the downstream end of the valve seat seal.

同时介质压力与上游端挠性结构的回弹力又增加了下游端阀座的密封。

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