valve set电子管组valven.瓣膜；真空管；阀门；电子管Valved bovine jugular vein牛颈静脉带瓣管道valve lash adjusting screw气门间隙调节螺钉valve for dischargeing gas排气阀valve controlled variation阀控变量valve spring retainer lock气门弹簧锁销Valve controlling cylinder阀控液压缸valve type echo suppressor电子管式回波抑制器Valve Position Switch Unit阀位开关装置valve of inferior vena cava下腔静脉瓣Valve formation obstruction瓣形成性梗阻