... 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 ...
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... 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 ...
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... 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 ...
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When installing the Series 4700, it is recommended that galvanized steel back up rings be used behind the valve flanges.
在安装系列4700夹管阀时，建议在阀门法兰后面采用镀锌钢支撑环加固。
PVC flocking materials used by high-frequency hot press molding, gas valve back up, with both gas permeability and gas leak-proof function.
用植绒PV C料经高频热压成型，倒阀门气嘴，具有双层防漏气渗气功能。
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