| 摘要 |
A system for sealing between a rotating part and a stationary part has two seals in series with a cavity formed between them that is pumped to a low pressure. Failure of either seal is detected by a change in pressure in the cavity. An alarm may be triggered when cavity pressure rises above a threshold, or when it remains above a threshold for more than a predetermined period of time. Multiple cavities connected to a common pump allow cavities to be selectively isolated so that a cavity experiencing a leak is identified.
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