Positive Displacement Pump

A positive displacement pump makes a liquid move by trapping a set amount and forcing (displacing) that trapped volume in to the discharge pipe. … Liquid flows in to the pumpas the cavity on the suction part expands and the liquid flows out from the discharge because the cavity decreases.

The most typical type among centrifugal pump may be the radial flow pump. … The main difference between these types of pumps and centrifugal can be that positive displacement pumps will move liquid at the same acceleration regardless of the pressure on the inlet end and centrifugal pumps won’t