periodic settling
... 周期性下降：cyclical downturn 周期性下沉：periodic settling 周期性微生物采油法：cyclic microbial recovery ...
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由于通往阀腔的进汽管被密封，凝结水从集水仓流经进水管进入阀腔，倒吊桶下沉，打开排水阀嘴，周期性的开始排水。
When the water level of condensate in the drain sump drops, the cup to shut the admission pipe falls down, the passage for steam to enter into the valve body is opened.
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