用于使局部真空的抽吸泵。
齿轮泵带负荷停车时，亦可防止泵倒转而在其输出管道内产生局部真空。
Gear pump to stop loading machine, can be in the output pipe to prevent pump reverse, and create a partial vacuum.
叙述了一种用于局部真空电子束圆形焊缝的自动跟踪系统的设计和试验过程。
The design and experimental process of an automatic tracking system applied to local vacuum electron beam welding are dealt with in this paper.
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