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How Do Lobe Pumps Work?

The pumping action of the rotary lobe pump principle is generated by the counter rotation of two pumping elements (rotors) within a chamber (rotor case). The rotors are located on shafts, which in turn are mounted within an external gearbox and supported by bearings; the timing gears are also located on the shafts.

The timing gears transfer the energy from the drive shaft to the driven shaft, synchronizing the rotors such that they rotate without contact with each other. As the rotors pass the suction port, the cavity generated increases creating a pressure decrease, which induces the pumped medium to flow into the rotor case.

Advantages Lobe Pumps

➤ Damage free: Often used in food applications because lobe pumps handle solids without damage to the product
➤ Larger particle size: the particle sizes that can be pumped are often larger in lobe pumps then in other positive displacement pumps
➤ Low viscosity liquids can be handled with diminished performance
➤ No metal to metal contact
➤ Suitable for hygienic applicatins due to superior CIP/ SIP capabilities

The core benefits of using a lobe pump are the perfect cleaning capabilities, the ease of maintenance and the extended life time thanks to the improved construction. Lobe pumps mean reliable and safe pumping of food and pharma related fluids.

Applications Lobe Pumps

Lobe pumps can be used in a variety of applications, like below, but are not limited to:

  • Polymers
  • Paper coatings
  • Soaps and surfactants
  • Paints and dyes
  • Pharmaceutical applications
  • Food applications



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Rotary Lobe Pumps