A test and pressure relief valve should be installed to assure relief of internal pressure prior to servicing and as a visual indication of trap operation.
应该安装一个测试和压力安全阀，确保内部压力能够在维修前得到释放，并作为疏水阀工作的直观显示。
Precipitation of, at the same time, USES the special relief valve to keep the battery internal pressure.
的析出，同时，采用特制安全阀使电池保持一定的内压。
A pressure relief valve is also provided at the top of the chamber to allow the vapor to escape when a predetermined internal pressure is reached.
在腔室顶部还有一个压力释放阀，当达到腔室内预定的内部压力时，压力释放阀可释放蒸汽。
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