PISTON PUMPS

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Positive displacement Pumps

Positive displacement pumps use mechanical energy to transfer fluid
Piston pumps

If the displacement is on the forward stroke only then the pump is single acting. The pump shown displaces liquid on the forward and return stroke and so is double acting.

This means that positive displacement pumps are capable of delivering very high pressures.

These pressures can be much in excess of the design pressure and so the pump must be protected by a relief valve.

Positive displacement pumps are self-priming as the suction and delivery are positively separated during pumping.

Axial Piston Pump

radial piston pump