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Rotary Lobe Pumps

Rotary Lobe Pumps

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Axflow is one the UK's largest suppliers of rotary lobe pumps & circumferential piston pumps

4 series from 2 manufacturers

Rotary lobe pumps are positive displacement pumps that create moving cavities between the synchronised lobes in the pump chamber that move the fluid around the pump chamber. Rotary lobe pumps are one of the most useful types of positive displacement pumps and are particularly wide spread in the food and beverage industry.


Advantages of Lobe Pumps

  • Pass medium solids.
  • No metal-to-metal contact.
  • Superior CIP/SIP capabilities
  • Can offer short term dry run capabilities.
  • Non-pulsating discharge.
  • Can be constructed for hygienic and sanitary applictions.

Typical Applications for Lobe Pumps

Because lobe pumps offer a gentle pumping action and run at low speeds they are good in applications involving solids and high viscosity fluids. This means that they are commonly found in two very different environments. 


We specialise in hygienic lobe pumps and large lobe pumps for industrial applications.

AxFlow holds over 1,600 lobe & ECP pumps in stock which us to offer a reliable delivery on bare-shaft pumps of 2-3 days and new pump-sets of under 3 weeks.

To support our pumps in the field, AxFlow holds over 128,152 spare hygienic pump components and kits in stock available on a standard 2-3 or express 24-hour delivery.

We offer three types of rotary lobe pump design.

The Waukesha external circumferential piston pump (ECP) design evolved from the traditional lobe pump design. The long sealing path of the winged rotors reduces slippage and offers gentle handling of particulates. They perform better with liquids which require gentle handling, low viscosity, and high viscosity or contain abrasives.

For more details on the ECP pump design click here.

Product Series






Max Flow m3/hr

Max Pressure bar

Max Viscosity



Hygienic lobe pumps




700 cP


Universal 1

Hygienic ECP lobe pumps



200K cP

Very Low

Universal 2

Hygienic ECP lobe pumps



200K cP

Very Low

Universal 3

Hygienic ECP lobe pumps



200K cP

Very Low

Universal 420/520

Hygienic ECP lobe pumps




200K cP

Very Low


Rubber lined lobe pumps







100k cP



Rubber lined lobe pumps







100k cP



Rotary Lobe Pump Maintenance 

  1. Rotary lobe pumps usually have both bearings and geared motors both the bearings and gears require lubricating on a regular basis.
  2. Many rotary lobe pumps use mechanical seals these need regular inspection. Particularly if the mechanical seal has bearing oil on the outboard side that could leak into the fluid being pumped.

If you encounter a reduction in performance over time be this flow or pressure, then the internal components may have worn. The solution to this issue is to replace the lobes/wings with oversized replacements and reduce the internal wall thickness to maintain the original tolerances.

Specific maintenance requirements may vary depending on the brand and model of your rotary lobe pump. Always refer to the specific manufacturer's documentation and gudelines for detailed instructions and recommended maintenance intervals

How to Select Rotary Lobe Pumps

  • Fluid Compatibility: Ensure that the Lobe pump is compatible with the fluid you intend to transfer. Factors to consider may range from chemical composition, viscosity, temperature, and abrasiveness.

  • Flow Rate and Pressure Requirements: Determine the required flow rate and the desired discharge pressure, ensuring that the Lobe pump's capacity correlates with your application.

  • Fluid Viscosity: Confirm that the pump can handle the viscosity of the fluid being pumped. Some applications involve highly viscous or shear-sensitive fluids, which may require specific rotor configurations.

  • Solid Handling Capability: If your application involves pumping solids, such as food particles or slurry, choose a pump with the appropriate rotor design and clearance to accommodate solids without clogging.

  • Cleanability and Sanitary Requirements: In industries like food, pharmaceuticals, or cosmetics, consider the pump's cleanability and ability to meet sanitary standards to prevent contamination.

  • Material Compatibility: Ensure that the materials used in the pump's construction are compatible with your fluid and won't corrode or degrade over time.

  • Temperature Range: Verify that the pump can handle the temperature range of your application, especially if it involves hot or cold fluids.

  • Maintenance and Serviceability: Assess the ease of maintenance and availability of replacement parts. Some pumps are designed for quick and straightforward maintenance.

  • Manufacturer Reputation and Support: Choose a reputable Lobe pump manufacturer, AxFlow supply Rotary Lobe pumps from APV and Boyser


Always be cautious when it comes to using a smaller model running at a faster running speed as this could be the most expensive option when you include maintenance costs.

How does a rotary lobe pump work. 

Rotary lobe pump fault diagnosis




PD Pumps Team
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