The secret is in the rubber sleeve - the valve's only wetted part.

秘密就在于阀门内唯一与流体接触的部件--橡胶套管上.

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The key to this valve is in the flexible reinforced rubber sleeve - the valve's only wetted part.

其主要原因就在于这种阀门内部的弹性强化套管,也就是这种阀门唯一与流体接触的部件.

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