The circumstance of mechanical seal invalidation is simply introduced and the main cause of mechanical seal installation is analyzed in this paper.
简要介绍了机械密封失效的情况，并分析了机械密封失效的主要原因。
The black seal frame around of glass can be seen, it is suitable for inlaying installation with pressing strip around it.
玻璃四周显露黑色密封边框，适用于周边压条镶嵌安装。
Dome is a vertical type. hoop is used to fix and seal fosc cover and base, and its installation is quite simple.
光缆接头筒外形是椭圆型直立式结构设计，筒和底座采用抱箍锁紧固定密封，安装十分方便。
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