Positive Displacement Pumps

Manufacturer Type Markets
Wilden Positive Displacement Pumps Wilden Air Operated Diaphragm Pump
  • Food
  • Pharmaceutical
  • Chemical
  • Wastewater
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EnviroGear Pumps Positive Displacement Pumps Enviro Gear Gear Pump
  • Paints
  • Coatings
  • Asphalt
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Mouvex Positive Displacement Pumps Mouvex Eccentric Disc Pump
  • Food/Sanitary
  • Refined Fuel
  • Chemical
Almatec Positive Displacement Pumps Almatec Air Operated Diaphragm Solid Block Pumps
  • Chemical
  • Ceramic
  • Semi-conductor
  • Paper
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Tuthill Positive Displacement Pumps Tuthill Gear Pump
  • Agriculture
  • Chemical
  • Food and Beverage
  • Construction
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Neptune Positive Displacement Pumps Neptune Chemical Feed and Injection Type Pumps
  • Genwildereral industry
  • Power
  • Oil and Gas
  • Food and beverage
  • Wastewater
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Verder - passion for pumps Positive Displacement Pumps Verder/Alpha Laval Sanitary Lobe Pumps
  • Food and Beverage
  • Pharmaceutical
  • Chemical
  • Wastewater
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Vogelsang Positive Displacement Pumps Vogelsang Rubber lined Lobe, Shredder, Macerator, Hopper Feed Pumps
  • Food
  • Pulp and Paper
  • Chemical
  • Biogas
  • Municipal & Industrial Wastewater
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General Pump Positive Displacement Pumps General Pump Piston High Pressure Pump
  • General Industry
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EnviroGear Pumps PCM PCM​ Progressive Cavity Pumps
Food Grade Peristaltic Pumps​
Diaphragm Dosing Pumps
Dosymix Inline Mixers​
Transfer, Dosing & Filling Food Systems​
  • Food​
  • General Industry​
  • Oil & Gas
  • Waste Water
Request a Quote


Positive displacement pumps are used in a variety of applications.  They function by trapping a specific amount of fluid inside a cavity and then pushing the fluid to the exit port of the pump. Typically, users elect to use positive displacement pumps when they want consistent flows and viscosities are too high to be handled by centrifugal pumps. Glauber Equipment is a premier supplier of positive displacement pumps.  A more detailed explanation of how displacement pumps can work for your specific application is outlined below.

About Positive Displacement Pumps

With a positive displacement pump, liquid flows into the pumps as the cavity on the suction side expands and the liquid flows out of the discharge as the cavity collapses. The volume is a constant given each cycle of operation. The positive displacement pumps can be divided in two main classes, reciprocating and rotary.

They are typically used to pump high viscosity fluids where high force output is necessary.  They frequently are used in these applications:

  • Chemical injection
  • Paint spraying
  • Oil production
  • High force washing

How Does a Positive Displacement Pump Work?

A positive displacement pump moves liquids by pressurizing the fluid, allowing it to pass through the system and be drawn into an expanding chamber. Once the specified volume of liquid is in the chamber, it then contracts and forces the fluid out of the pump. Its design ensures a consistent discharge of fluid at the pressure required to move it through the system’s piping. Positive displacement pumps provide constant flow with changing pressure. Also, its efficiency increases with increasing viscosity and increasing pressure.

The liquid is drawn into the pump by creating negative pressure at the inlet port, making the pump self-priming and ensuring a continuous flow regardless of pressure. Typically, these pumps operate at lower speeds and produce more pressure than a centrifugal pump. They are a common component of hydraulic systems and other applications that require high pressure and low flow rates.

Positive displacement pumps shouldn’t operate against closed valves on the discharge side of the pump. There is no shut off head on them like on centrifugal pumps. If so, operating against closed discharge valves continues to produce flow until the pressure in the discharge line is increased until the line bursts or the pump is severely damaged – or both.

Positive Displacement Pump Terms

To obtain a better understanding of positive displacement pumps, it’s helpful to examine the different types and the terms associated with them.

Rotary Pump

Rotary positive displacement pumps move fluid through the use of a rotating element. The element develops a liquid seal with the pump casing, creating suction at the inlet port and displacing the fluid from the reservoir to the outlet.

Reciprocating Pump

In a reciprocating pump, the repeated backward and forward movement of a diaphragm, piston or plunger transports the fluid from the reservoir. The reciprocation or cycle of the driving element creates suction at the inlet port and compression at the outlet.

Linear Pump

A linear pump moves the fluid in a straight line by using a mechanical element to capture the liquid and move it through a tube to the outlet port. The volume capacity of a linear pump is limited, but because this type of pump is set in a static location, calibrations are not necessary.

Working With Glauber Equipment

Glauber Equipment specializes in producing a wide range of positive displacement pumps designed to meet the specific applications of our clients. They meet the needs of many applications, including:

Glauber Equipment has nearly 60 years of experience and is dedicated to providing exceptional customer service. Our team has the skill and expertise to create innovative solutions designed to meet our clients’ needs.

To learn more about our industrial pumps, contact us today.