Um positive displacement pump makes a fluid move by trapping a set amount and forcing (displacing) that trapped volume into the discharge pipe. … Liquid flows into the pumpas the cavity on the suction aspect expands and the liquid flows out of the discharge since the cavity decreases.
The most common type among centrifugal bomba may be the radial flow pump. … The main difference between these 
kinds of pumps and centrifugal is certainly that positive displacement pumps will move liquid at the same speed regardless of the strain on the inlet end and centrifugal pumps will not
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