VFD Pump Control


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Is VFD pump control faster than pneumatic valve control when controlling pump discharge pressure or flow?
I'd seriously doubt it. The VFD is limited in both the speed with which it can increase flow (current capacity of the drive) and decrease flow (can't stop the impeller on a dime without external braking). I'm not an expert in pneumatic control valves, but I'd think the only limit on speed would be how fast you can supply or relieve the air.