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。

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The valve bonnet may now be removed. There may be slight leakage as the backseat does not provide a drip-tight seal.

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。

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The valve bonnet may now be removed. There may be slight leakage, as the metal-to-metal backseating does not provide a drip-tight seal.

现在可以拆卸阀门的阀盖。当金属-对-金属后座无法提供无滴漏密封时，可能会有点泄漏。

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