seal end cover 密封端盖
At the end of the letter, seal it in an envelope, write the date to open it on the cover and put it in a safe storage space.
写完信，把它装到信封里，在信封的封面上写上日期，把它妥善保管起来。
End cover structure of the APS and 400 spring series is suitable for most of the rotation and swing seal.
端盖式结构的APS和400弹簧系列适用于大部分的旋转和摆动密封。
Moreover, the obturating ring can reliably seal the cylinder and the end cover.
且密封圈能将筒体和端盖可靠的密封。
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