百叶窗;闸板 shutter百叶窗式挡板 louver damper摆阀式活塞泵 swing gate piston pump保温式 Steam jacket type报警阀;信号阀;脉冲阀 sentinel valve背压调节阀 back pressure regulating valve背压率 Rate of back pressuec本体阀杆密封 body stem seal波纹管阀 Bel...

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阀门种类：Air valves  空气阀门啤酒英语词汇Wafer Check Valves  对夹式止回阀Stop valves  截止阀Throttle Valves 节流阀Auxiliary valves  辅助(副)阀Brake valves  制动阀Butterfly Type Non-slam Check  蝶式缓 冲止回阀B...