Positive Displacement

As a distributor of rotary positive displacement pumps in Colorado, Wyoming and the Rocky Mountain states for over 80 years, Centennial Equipment can provide expertise for all your PD pump needs. We work with a selection of industry leading positive displacement rotary gear pump manufacturers to provide solutions that precisely meet to your pumping requirements.

At Centennial Equipment, we help customers meet pd pump challenges with cost effective solutions. Our experienced staff will partner with you to evaluate your specific requirements for your application. We provide assistance in selecting the most energy efficient, dependable rotary positive displacement pump for your medium and application.

Your Rotary Positive Displacement Pump Experts

Centennial Equipment has expertise with all types of rotary equipment, so contact our engineers for assistance selecting or maintaining your rotary positive displacement pump. We will partner with you to design the best positive displacement pumping solution.

Centennial Equipment offers a wide variety of rotary pump types from top industrial positive displacement pump PD pump manufacturers. Browse our products below.


What Is a Positive Displacement Pump?

Every positive displacement pump causes a fluid to move by trapping a fixed amount of fluid and then forcing that trapped volume into the discharge pipe or displacing the fluid. There are two main types of positive displacement pumps – reciprocating and rotary.

With reciprocating positive displacement pumps, a certain volume of liquid is collected in enclosed volume and is discharged using pressure. There are different types of reciprocating pumps including piston pumps, plunger pumps and diaphragm pumps. All are more suitable for low volumes of flow at high pressures.

What Is a Rotary Pump?

A rotary pump is a positive displacement type pump with a chamber that contains elements that are actuated by the relative rotation of the drive shaft to the casing. These elements may be gears, cams, screws, lobes, vanes, plungers or similar elements. The casing has no separate inlet or outlet valves.

Based on the elements that rotate, there are several different types of rotary pumps including:

  • internal or external gear pump
  • screw pump
  • lobe pump
  • shuttle block
  • flexible vane or sliding vane
  • circumferential piston
  • flexible impeller
  • helical twisted roots
  • liquid-ring pump

What Is a Rotary PD Pump Used for?

A rotary PD pump is often used for high viscosity fluids. In fact, a rotary pump is one of the main types of PD pumps used across many industries, due to the versatility of designs. Uses for a rotary PD pump include:

  • Food processing
  • LACT pipeline
  • Asphalt
  • Ethanol
  • Chemical
  • Lubricant
  • Glycol
  • Diesel

Benefits of a Positive Displacement Pump

One of the main advantages of a positive displacement pump is its ability to produce a consistent flow rate even when there are changes in pressure. Centrifugal pumps, on the other hand, are designed to react to changes in pressure.

As previously mentioned, a PD pump is also good for highly viscous fluids, because the flow rate of a positive displacement pump increases as viscosity increases. In addition, because PD pumps do not have any high-speed components, they will not apply a great deal of shear to fluids, so they are ideal for shear sensitive mediums. They are also specified for applications that require suction lift capabilities.

Rotary PD Pump Costs

Many different types of positive displacement pumps are available at various price points. Choosing the best PD pump helps optimize performance, while poor selection leads to wasted energy and increased lifetime pump cost.

Our team can develop durable, cost-effective rotary pump solutions for your unique requirements in Colorado, Wyoming and the Rocky Mountain states. Contact Centennial Equipment today and let our team help you find the best positive displacement pump solution for your needs.