?列车后端制动阀

... choker checkvalve 阻气单向阀 back-up valve 列车后端制动阀 centrifugal sa plate valve 离心数心情的圆盘保险(溢流)阀 ...

[机]?升压阀

... back-up 备用品[零件，设备] ；撑持[撑] back-up valve 升压阀[在低的环境温度下，为了下降空冷式冷凝器的才能，以保护必定排气压力的设备] back valve 单向阀，止回阀 ...

?列

... back-pressure valve 止回阀 back-up valve 列 车后端制动阀 balance pressure reducing valve 平衡减压阀 ...