UPPER VALVE SPRING RETAINER 上气门弹簧座
upper valve cap 上部阀盖
upper valve gear housing 顶罩汽门室罩
upper valve spring collar 气门弹簧上环
upper valve seat 上端阀座
Upper valve crosshead guide [铁路] 上导框
Upper Valve Body 上阀体
upper scum valve 上排污阀
Said rotary control disk rotates around the central axle on upper valve body to exchange position with conic valve core, so allowing medium to flow.
上阀体上装有中轴，旋转控制盘绕中轴转动与上下滑动锥形阀芯换位，实现介质流量、流向控制。
At this point the upper stem has lost contact with the diaphragms. The valve should be opened to this point but not back seated.
在此时，上阀杆已经失去了同横膈膜的接触。阀门应该开启到这一点，但不能反向固定。
Upper and lower bushings are standard for smooth valve operation.
上部和下部衬套符合流畅平稳轻松操作阀门的标准要求。
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