Positive Displacement Pump

A positive displacement pump makes a fluid 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 out of the discharge since the cavity decreases.

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

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