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

The most common type among centrifugal pump is the radial flow pump. … The main difference between these kinds of pumps and centrifugal can be that positive displacement pumps will move liquid at the same rate regardless of the strain on the inlet end and centrifugal pumps won’t