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A positive displacement pump makes a fluid move by trapping a fixed amount and forcing (displacing) that trapped volume in to the discharge pipe. … Liquid flows into the pumpas the cavity on the suction side expands and the liquid flows out of the discharge since the cavity decreases.

The most common type among centrifugal pump may be the radial flow pump. … The primary difference between these types of pumps and centrifugal is certainly that positive displacement pumps will move fluid at the same quickness regardless of the pressure on the inlet end and centrifugal pumps won’t