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。
2
Seal coating sprayed is currently used to adjust the gap between the blade tip and engine casing and improve engine efficiency.
采用喷涂封严涂层的方法调整叶片端部与发动机涡轮机壳之间的间隙以提高发动机效率。
3
The flare system is equipped with knock-out drum, seal drum, stack, molecule airproof, flare tip, pilot and ignitor .