How to use steam vacuum?
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This post was last edited by libingtaoff8 on 2016-12-5 10:24 Three-stage steam vacuuming. Why is the third stage used first, then the second stage, and the last stage when it is put into use? Are there any drawings?
It is necessary to reduce the pressure at the outlet of the primary and secondary injectors to negative pressure for the primary and secondary injectors to work.
The evacuation device relies on speed kinetic energy to be converted into pressure energy. If the back path is not smooth, the kinetic energy will be small and the vacuum degree will be low. Throw three-two-one and stop one-two-three.
http://bbs.hcbbs.com/thread-1003857-1-1.html See this post for the principle
The conventional approach is like this. Only when the back road is clear can the front be started.