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。
The valve should be opened to this point but not back seated.
阀门应该开启到这一点，但不能反向固定。
A step on the stem has now been back-seated against the upper portion of the valve body.
阀杆上的台阶现在已经坐落在阀体的上面部分上。
A step on the stem has now been back-seated against the upper portion of the valve body.
阀杆上的台阶现在已经坐落在阀体的上面部分上。
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