Describing several structures of stem seal and existent problems.
阐述了阀杆密封的几种结构及存在的问题。
The backup seal is secondary to the main stem seal assembly (20) in the bonnet (12).
备用密封件是阀帽(12)内主阀杆密封组件(20)的二级密封。
Introducing a new type of structure for replaceable stem seal sleeve with containing pressure and analyzing its high performance.
介绍了一种新型的可带压更换阀杆密封的结构，分析了该结构的优良性能。
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