The interactive graphic on their website leads me to believe the CSV is a flow modulated throttling device. It reduces pump output by raising back pressure to the end of the pump curve where motor current goes down.
My first concern would be that a centrifugal pump can boil water at this end of the curve. Submersible pumps depend on flowing water to cool the motor. Perhaps it isn't a problem but I would ask the manufacturer to address this.
I addressed the short cycling problem on my submersible by using a smaller pump and larger bladder tank. This may not be an option if your short term demand is high.
Doug
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