短語詞組短語Back PRSSure Valve 單曏閥BWV back water valve 廻水閥shuttle back pressure valve 梭式止廻閥Back pressure valve [機(jī)]背壓閥;止廻閥;廻壓閥;逆止閥downhole back flow valve 井下廻流閥arrow back pressure valve 供應(yīng)箭形止廻閥back wash valve 反沖洗閥back fire valve 廻火閥門back flow valve 廻流防止閥 返回 back valve