Application and function of positive displacement pumps

Displacement pumps offer efficient solutions for conveying media and contribute to the optimization of processes.

Maintenance and control of the oscillating ring pump

pumps are an essential part of numerous industrial processes. They play a crucial role in the movement of liquids or gases in various applications. A significant type of pump, which is widely used in various industries, is the positive displacement pump, as is our wobble ring pump. This pump types are characterized by their efficient and reliable operation and are known for their diverse range of applications.

Positive displacement pumps belong to the category of volumetric pumps, which use moving parts to deliver liquids or gases in an enclosed space. In contrast to flow pumps, in which liquids are set in motion by impulse action, positive displacement pumps generate a continuous flow of liquid through physical displacement.

About our positive displacement pump - the wobble ring pump


A positive displacement pump or forced conveying pump is a type of pump that is used to deliver liquids or gases. The pump technology forces these liquids or gases into a constricting space. Displacement pumps work based on the principle of change in volume. They are widely used in a wide range of applications, from water supply to chemical industries. This text provides you with a detailed introduction to how they work, the different types of positive displacement pumps and their applications.

Basic operating principle of the positive displacement pump

The operating principle of a positive displacement pump is based on the fact that they capture liquid or gases in a specific volume. This is then pushed through a narrowing space and thus a Pressure increase produces. This process is repeated continuously and results in the medium being promoted.

There are two main types of positive displacement pumps. On the one hand, there are oscillating pumps and, on the other hand, there are rotating pumps.

Oscillating Positive displacement pumps use reciprocating piston or diaphragm movement to deliver the medium. With each stroke, the volume of the working space is changed. This process results in a pressure difference which sucks the medium into the pump and then expels it. Examples of oscillating pumps include piston pumps and diaphragm pumps.

piston pumps consist of a cylinder and a piston that moves back and forth. When the piston moves towards the outlet, the medium is expelled. When the piston moves towards the inlet, the medium is sucked in.

diaphragm pumps use an elastic membrane that moves back and forth to deliver the medium. The difference in pressure creates a bending or oscillating movement of the membrane, which sucks in and expels the medium.

Rotating Positive displacement pumps use rotating elements to deliver the medium. These pumps use the Volume change principle. They trap the medium in rotating chambers and then push it into a narrowing space. Examples of rotating pumps include gear pumps, screw pumps, and wobble ring pumps.

gear pumps consist of two interlocking gears that rotate to deliver the medium. The medium is trapped between the teeth of the gears and transported from the inlet side to the outlet side.

screw pumps use two screws that rotate in opposite directions and move the medium from the intake side to the outlet side. The screws create a continuous volume that forces the medium into the narrowing space and builds up the necessary pressure.

wobble ring pumps consist of a cylindrical housing with an eccentrically mounted swashplate. The swashplate rotates around its own axis while simultaneously tumbling around the axis of the housing. This movement creates changing volumes in the chambers between the swashplate and the housing. These suck in the medium and then pump it.

You can find out more about the wobble ring pump in our product brochures.

Product brochure (DE)

Product brochure (EN)

Product brochure (NL)

Wobble ring pump components

Applications of positive displacement pumps

Positive displacement pumps are found in many industries. They are commonly used to transport chemical fluids, including aggressive or viscous media. Its robust construction enables use in demanding environments.

In the oil and gas industry, positive displacement pumps are used. They extract and transport oil, gas and other liquids from drilling wells.

Displacement pumps play an important role in food processing, in particular when pumping viscous liquids such as sauces, syrups or Teigen.

In the pharmaceutical production positive displacement pumps are used to gently pump and precisely dose liquids and suspensions.

Displacement pumps are also used in the water supply used to extract drinking water, treat waste water and operate irrigation systems.

What are the advantages of positive displacement pumps?

  • Precise delivery: Displacement pumps enable accurate dosing and delivery of liquids and gases, which is crucial in many applications.
  • Self-priming: Many positive displacement pumps are able to suck themselves in and deliver the medium from lower levels. This makes installation and use more flexible.
  • Ability to handle viscous media: Displacement pumps are able to effectively deliver viscous media without loss of performance or impairment.
  • Robust construction: Displacement pumps are often made of robust materials such as metal. This gives them a high permanence against corrosive or abrasive media.
  • Versatility: There are various types of positive displacement pumps that are suitable for different applications, from small dosing pumps to large industrial pumps.

In summary, due to their volume-changing principle and their versatile range of applications, positive displacement pumps can be used in many industrial sectors are widely used. They offer a reliable and efficient solution for pumping liquids and gases. With their precise dosing and ability to handle viscous media, they meet the requirements of a wide range of applications.

How is the ideal positive displacement pump selected?

The selection of the appropriate positive displacement pump depends on various factors. This includes the type of funding Mediums, the required flow rate, pressure range, and the specific requirements of the application. It is important to carefully analyse the operating parameters and to select the appropriate positive displacement pump accordingly. This is the only way to ensure optimal performance and efficiency.

When installing and servicing positive displacement pumps, it is necessary to regularly check and maintain the seals, valves and wear parts are required. This ensures long-term reliability and performance. In addition, operating conditions, such as temperature and pressure, should be monitored and maintained to prevent potential damage or failures.

Innovations in positive displacement pump technology focus on improving efficiency, which energy saving and environmental friendliness. Through the use of advanced materials, optimized designs and modern control technologies, positive displacement pumps are becoming ever more powerful and reliable. In summary, positive displacement pumps play an important role in a wide range of industries. Its ability to deliver liquids and gases precisely makes it an indispensable component. It works in numerous applications, from the chemical and food industries to water supply and oil and gas production. Through continuous technological development, positive displacement pumps offer efficient solutions for conveying media and contribute to optimising processes and increasing productivity.

Back to the overview

More articles

Self-priming industrial pumps

Self-priming industrial pumps are essential in many industrial applications.

Learn more

Industrial pump control

The control of industrial pumps is an essential aspect in many industrial applications.

Learn more

What is a sine pump?

Sinus pumps are characterized by their ability to deliver liquids gently and precisely.

Learn more