Double packing with leak - off.

带无泄漏的双填料.

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The leak - off is provided to allow collection of leakage from the lower packing set.

无泄漏能够从低部填料上收集泄漏介质.

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Long - life leakproof packing chamber with double packing and leak - off or single set packing.

配置双填料和无泄漏的长寿命防泄漏填料腔或单填料.

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