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

1. The additional benefit of lifting the plug is the low friction and low torque required to cycle the valve.
   提升阀塞的其他优点是循环操作阀门所要求的低摩擦和低扭矩。
2. The facing is deposited on the plug and body seats and is then machined to a mirror-like surface.
   阀塞和阀体阀座表面先由沉积层形成，然后经过机加工制成镜面光洁度表面。