Positive Displacement Pump

A positive displacement pump makes a fluid move by trapping a fixed amount and displacing that trapped volume into the discharge pipe. Some positive displacement pumps use an expanding cavity on the suction side and a decreasing cavity on the discharge side.

The benefit of a positive displacement pump is that the volume of liquid is constant for each operational cycle.

There are many benefits of positive displacement pumps for varying applications.

  • Positive Displacement pumps are sometimes called constant-volume pumps because they maintain a constant speed and flow. Even if the system pressure varies, the flow remains constant.
  • Positive Displacement pumps can handle a variety of fluid types: high, low and variable viscosity; shear sensitive fluids; solids; and liquids with a high percentage of air or gas entrainment.
  • Their capacity is not affected by the operation pressure.
  • They can be more efficient than centrifugal pumps when handling viscous fluids.
  • Positive Displacement pumps are able to self-prime.
  • They can be designed as a sealless pump.

Positive displacement pumps have a wide variety of applications within industrial processing markets such as:

  • Polymers
  • chemical processing
  • bulk transfer
  • asphalt
  • chocolate
  • adhesives
Bradd Statley

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“We have always been able to count on McKenna for innovative solutions to solve our materials handling challenges.”

McKenna Engineering offers sales, service, and repair to Positive Displacement Pump from the following manufacturers:


Leistritz is a manufacturer of positive displacement and rotary screw pumps that serve the demands of airspace, energy, shipbuilding, industrial processing, and crude oil and gas production.


Liberty is a leading US manufacturer of pumping products for ground water and wastewater removal in commercial applications. Liberty's wide range of pump styles includes; sump pumps, sewage pumps, effluent pumps, drain pumps, grinder pumps, and complete pre-assembled sewage packages.


Viking is a leader in the world of positive displacement pumps for use in some of the toughest applications. Their products are utilized in nearly every industry; military, to food and beverage, to chemicals, fuels and plastics - reliably pumping materials that are thin, thick, hot, cold, liquid, solid, etc.


Aqua specializes in water pumps and water treatment. With a wide selection of well pumps and tanks for deep or shallow wells Aqua also carries a complete line of submersible and jet pumps, water filters, and supplies.

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