These valves feature an eccentrically mounted disk and a PTFE or 316 stainless steel seal ring.
这些阀门具有一个偏心安装的磁盘和聚四氟乙烯或316不锈钢密封环。
A new returnable actuator disk of metal seal structure butterfly valve was presented, and its principle, force analysis, characteristic of the actuator were discussed as well.
提出了一种双向压金属硬密封蝶阀蝶板可逆回转机构，讨论了可逆回转机构的工作原理、受力分析及特点。
Most of the hard disk is fixed hard drive, is permanently seal fixed in the hard disk drives.
绝大多数硬盘都是固定硬盘，被永久性地密封固定在硬盘驱动器中。
A design about authentic CPK electronic seal system encrypted by USB Flash Memory Disk was given first time in this article.
文章首次在国内公开论述了以USB闪存固件为加密载体的不可破解的CPK电子公章系统的设计思想；
A design about authentic CPK electronic seal system encrypted by USB Flash Memory Disk was given first time in this article.
文章首次在国内公开论述了以USB闪存固件为加密载体的不可破解的CPK电子公章系统的设计思想；
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