A test and pressurerelief 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。
2
Purpose: To test operation of pressure differential relief valve.
目的：检测差压安全阀的工作性能。
3
According to the requirements of aircraft maintenance manual related to alkaline valve test, a specified alkaline battery relief valve pressuretest equipment has been developed in this paper.