The classification of the positive displacement pumps is given below: 1.1) Reciprocating Pumps The positive displacement pumps are further divided into multiple types. These pumps don’t need manual priming because they have self-priming ability. They operate by trapping a specific amount of liquid in the pump chamber through an inlet valve and expelling it via the discharge valve. The moving parts of these pumps discharge the fluid from the pump housing and increase the hydraulic pressure at the same time. The positive displacement pumps most commonly use moving parts (such as gears, lobes, plungers, pistons, or rotors) to transfer the fluids. Main Article: Positive Displacement Pumps
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