当阀门下游一侧出现压力时，第二止回阀必须是无滴漏。
Second check must be drip tight when pressure is applied to downstream side of valve.
现在可以拆卸阀盖。如果后座无法提供无滴漏密封，则会有轻微的泄漏。
The valve bonnet may now be removed. There may be slight leakage as the backseat does not provide a drip-tight seal.
膏体活塞式灌装机 配备了防止滴漏与拉丝的灌装闷头，确保灌装完毕后无滴漏，无拉丝。
The machine is equipped with prevent drip with wire filling cocks, ensure filling after the completion of a drip-tight, no drawing.
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