Open vent needle valve and bleed air from hose. Then close vent valve.
开启排气针形阀，并从软管排放空气。然后关闭排气阀。
Check the valve parts before installation. Open and close the valve by hand for a period check the open-close position of the valve gate.
检查阀门各部位是否有松动现象，对阀门进行手动开启、关闭一个周期是否有异常现象，同时检查阀门的启闭位置是否准确。
Open the upper sea inlet valve and close the lower one.
打开高位海底阀，关闭低位海底阀。
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