According to the work of a low pressure vacuum valves, ultra high vacuum valves and vacuum valves.

根据工作压力有低真空阀门、高真空阀门和超高真空阀门。

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The TK-DL can test pressure vacuum breakers, reduced pressure backflow preventers or double check valve assemblies.

TK - DL可以检测压力真空断路阀，减压防回流阀或双止回阀总成。

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Now, Engineered Enclosures are available specifically for pressure vacuum breakers with telescoping design for varied valve height.

我们公司设计的这款真空断路器外壳，可用于不同高度的阀门使用。

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Stratram would need to overcome a lot of challenges, particularly if squishy humans were among the things being transported into space: the track would need to be around 1, 000 miles long to avoid the kind of instant acceleration that could crush a human, and the train would need a low-pressure vacuum tube to travel through.

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But the fact is that in the kind of vacuum we have, the IRA is under pressure to act.

BBC: When is a ceasefire not a ceasefire?