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。
When valve is filled, open the downstream shutoff slowly and fill the water supply system.
阀门注满后，慢慢开启下游关闭阀对水供应系统注水。
With the valve in the closed position the downstream air exhausts to the atmosphere.
如果这种阀门出于关闭位置，则下游气体将排放到大气中。
With the valve in the closed position the downstream air exhausts to the atmosphere.
如果这种阀门出于关闭位置，则下游气体将排放到大气中。
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