Centrifugal pumps prevent evacuation problems
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As shown in the figure, in medical engineering, the online cleaning fluid return pump requires that the liquid in the tank be completely evacuated as much as possible. We usually choose a diaphragm pump, but the diaphragm pump has large vibrations. Sometimes a self-priming centrifugal pump is also selected. In order to prevent evacuation, a bypass is added to the outlet pipeline to connect to the pump inlet, as shown by the cloud line. I see everyone in the workplace drawing like this, and I have doubts about this design. Isn’t it possible to avoid cavitation by doing this?
Why not design a low liquid level alarm? Start with the control.
It's useless to call the police. This is a pump used in medical engineering to automatically clean tanks with lye. It pumps out as much lye as possible.
Self-priming pumps are not afraid of turbidity, so there should be no problem if you use them this way
This post was last edited by dahei9971 on 2019-1-22 23:27 You can set the low alarm detection point on the vertical pipe near the pump mouth. According to the control loop liquid level switch, the pump just absorbs the liquid in the pipe and stops the pump. The instrumentation personnel can calculate the distance between the liquid level switch and the pump. This is generally the case abroad, and the design regulations are also stipulated in this way.
Remember the location of the liquid level switch, not on the container, but on the pipe.
This post was last edited by dahei9971 on 2019-1-22 23:33 The settings of your valves indicate the cleanliness requirements of the device. Why don’t you see the cleaning pipeline? Ball valves should be selected for these valves, right? You should take a look at Procter & Gamble’s design regulations!