To test for tightness of second check Valve.
检测第二止回阀的密封性。
Second check must be drip tight when pressure is applied to downstream side of valve.
当阀门下游一侧出现压力时，第二止回阀必须是无滴漏。
The first delay was weather-related, the second was due to a faulty valve.
第一次延期与天气有关，第二次是由于一个阀门出现故障。
Second, the manual unloading valve didn't matter.
第二，手动卸荷阀没有关紧。
The first delay was weather-related, the second was due to a faulty valve.
首次推迟是由于天气，第二次是由于阀门故障。
The first delay was weather-related, the second was due to a faulty valve.
首次推迟是由于天气，第二次是由于阀门故障。
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