短语词组短語blow -off valve cam 放風閥凸輪silent blow -off valve 消音吹泄閥Blow -off valve seat 放水閥座automatic blow -off valve 自動吹泄閥;自動安全閥bypass blow -off valve 旁通放汽閥leaking blow -off valve 漏水排放閥 返回 blow-off valve