valveman阀门操作者
valven.瓣膜;真空管;阀门;电子管
valve seat insert阀座嵌入物
valve-seat bore气门座孔
valve release nut阀门释放螺母
valve-seat ring气门座镶圈
valve shaft lever阀轴杆
Valve subassembly阀门组件
Valve controlling阀门控制
valve timing sign气门正时标记
valve spring wire阀弹簧钢丝
valve performance阀性能