To indicate the level of the stem valve is opened or closed.

阀杆的高低能够指示阀门处于开启或封闭状态。

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These diaphragms prevent leakage along the valve stem.

这些横膈膜防止了沿着阀杆的泄漏。

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Valve Advantages: The replacement of elastomeric packings by metal diaphragms gives this valve superior leak integrity at the top works of the valve and stem.

阀门的优点：用金属横膈膜代替人造橡胶衬垫在阀门和阀杆的顶部机件处给予了这种阀门出众的泄漏完整性。

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