brass nonreturn valve 铜止回阀

nonreturn valve 通风〕止回阀 ; 单向阀 ; 止回阀

dryer outlet nonreturn valve 烘箱出口单向阀

extraction stop and nonreturn valve 抽汽截止 ; 逆止阀

screwdown nonreturn valve 截止止回阀

bilge suction nonreturn valve 舱底水吸入止回阀

NRV nonreturn valve 止回阀

automatic nonreturn valve 自动逆向阀

screw down nonreturn valve 截止止回阀

control nonreturn exhaust valve 止回操纵舌闭