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This post was last written by wx_ Edited at 2023-3-16 03:22,
What you understand is correct, but one thing is that when the inlet pressure drops to a certain value, the fluctuation you mentioned will occur. This fluctuation may be caused by cavitation. Another issue worth noting is the regulated object corresponding to the control signal of the valve, including pressure, temperature, flow, liquid level,,,,. If we could put it all together, this kind of phenomenon wouldn’t happen. Such as low liquid level alarm, then low pump can refer to a self-adjusting circuit valve control and other means. Can solve this kind of problem, for reference.
There is also the fact that the outlet flow rate of the pump has been turned down recently, which is a phenomenon that only occurs after the pump outlet is turned down. The flow rate has been turned on at such a low level before, and this has never happened before. Is it true that the outlet opening of all centrifugal pumps is too small, and cavitation will occur when the liquid level decreases?
What do the curves in the second picture represent?