Parallel connection of centrifugal pumps
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When multiple centrifugal pumps are connected in parallel, if the demand downstream decreases, the pump flow rate can be reduced using variable frequency drives; however, variable frequency drives also cause the pressure at the pump outlet to drop. Is there any way to reduce the flow rate while keeping the pump outlet pressure unchanged?
It’s impossible for the pressure to remain unchanged; with a lower flow rate, the resistance in the pipelines decreases, and therefore the pressure at the pump outlet must also decrease
Variable-frequency constant-pressure water supply system; take a look at this one
As the flow rate decreases, the pressure drop in the downstream pipeline also decreases, in a adaptive manner.
Do you have any more detailed information? What I’ve seen online is rather general
https://wenku.baidu.com/view/e651975ed1f34693dbef3eb6.html?from=search