Positive Displacement Pump

In the positive displacement pump the movement of the fluid is forced by reducing the volume of the pump chamber.

A distinction is made according to the movement type of the displacer. The types are rotary and reciprocating positive displacement pumps.

Oscillating positive displacement pumps include

  • Piston pump
  • Diaphragm pump

The following constructions are counted among the rotating positive displacement pumps:

  • Screw pump
  • Progressing cavity pumps (eccentric screw pumps)
  • Rotary lobe pump
  • Gear pump
  • Screw pump
  • Peristaltic pump

In opposition to the centrifugal pumps the positive displacement pumps are suitable for a very high viscosity of the pumped fluid. Furthermore the reciprocating pumps can be suitable for metering and dosing applications.

More articles on this topic

Reciprocating Piston Pump

Reciprocating piston pumps (also oscillating pumps) are a group within the positive displacement pumps where the volume of the pump chamber is periodically changed by an axial movement of the inner part (piston).

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