back pressure spring valve的意思|示意

背压弹簧阀 ... hydraulic back-pressure valve 液压止回阀 ; 水压逆止阀 back pressure spring valve 背压弹簧阀 BPV back pressure valve 背压阀 ...

止回弹簧阀 ... auxiliary valve spring 副阀弹簧 back pressure spring valve 止回弹簧阀 backpressure spring valve 背压弹簧阀 ...