valven.瓣膜；真空管；阀门；电子管valve key气阀制销,阀键,阀门键,气门扳手,阀门扳手valve end气门杆端部valvetypeadj.电子管式的valve tip气门杆头valve pit阀井valve rod阀杆valvelead气阀导程valve pin阀销,真空管脚valve cap阀盖Valventos瓦尔文托斯