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At this point the upper stem has lost contact with the diaphragms.
在此时，上阀杆已经失去了同横膈膜的接触。
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Grasp upper and lower stem lock nut with wrench and loosen.
用扳手抓住上部和下部阀杆锁紧螺母并且松开。
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Grasp upper and lower stem lock nut with wrench and loosen.
用扳手抓住上部和下部阀杆锁紧螺母并且松开。
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