The leaflets were sewn to the normalvalve annulus;
将切下的瓣叶缝合于正常三尖瓣环上；
2
In normal conditions, the opening control valve is moderate, even a small opening is short, so the normalvalve 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。
3
Corrosion products formed by these reactions can prevent normalvalve operation and can become embedded in the elastomeric stem tip, preventing the valve from making a complete seal.