The leaflets were sewn to the normal valve annulus;

将切下的瓣叶缝合于正常三尖瓣环上；

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Corrosion products formed by these reactions can prevent normal valve operation and can become embedded in the elastomeric stem tip, preventing the valve from making a complete seal.

这些反应产生的腐蚀产物会阻止正常的阀门运转，深入到人造橡胶阀杆顶端，造成阀门不能完全密封。

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In normal conditions, the opening control valve is moderate, even a small opening is short, so the normal valve can be used safely.

而在正常工艺条件下，调节阀的开度是适中的，即使小开度也是短暂的，所以调节阀可正常安全使用。

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Aortic valve regurgitation can be eliminated with surgery, and you can usually resume normal activities within a few months.

CNN: Aortic valve regurgitation

He said in such a situation, normal procedure would be for the contractor's crew to secure the well by closing off the huge valve sitting on the seabed known as a blowout preventer.

WSJ: BP Tries to Shift Blame for Spill to Transocean