sand valve

valve 阀门专业词汇A-Z ... sand valve stem 砂阀杆 sand valve 撒砂阀 scavenge valve (内燃机的) 扫气阀 ...

直角三角形_馆档网 ... "砂闸"," sand trap" "放砂阀"," sand valve" "洗砂器"," sand washer" ...