Positive Displacement Pump

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 in to the pumpas the cavity on the suction side expands and the liquid flows out from the discharge since the cavity decreases.

The most common type among centrifugal pump is the radial flow pump. … The primary difference between these kinds of pumps and centrifugal can be that positive displacement pumps will move fluid at the same quickness regardless of the pressure on the inlet end and centrifugal pumps will not

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