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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。
youdao
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The threads on the lower valve stem are in the wetted gas stream.
下阀杆上的螺纹是处在潮湿气流中的。
youdao
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The threads on the lower valve stem are in the wetted gas stream.
下阀杆上的螺纹是处在潮湿气流中的。
youdao