valveman阀门操作者valven.瓣膜；真空管；阀门；电子管Valve components活门组件valve of Houston直肠横襞, 直肠横褶, 休斯顿瓣valve of Tulpius回盲瓣, 诺尔皮厄斯瓣valveless engine无气门式发动机,无气门发动机valve scavenging气门换气valve spring key气门弹簧键valve reparation瓣膜修复valve yoke guide平阀框前杆valve spring cap气门弹簧托盘,阀簧座圈valve base patch气门座垫

1. Screw the cover onto the valve body.
   将阀盖旋在阀体上。
2. All valves have two purges in the valve chest or upper bonnet area.
   所有阀门在阀腔或上部阀盖区域都有两个净化清洗装置。