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。
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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