Circumferential Piston Pumps

The preferred positive displacement pump technology

Circumferential piston pumps are the proven and preferred pump type for all areas of food processing, beverage and cosmetic manufacturing.

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Circumferential Piston Pumps

Often confused with rotary lobe pumps, the circumferential piston pump (or rotary piston pump) uses special ‘sliding metal’ non-galling alloy rotors to offer strong self-priming capabilities and gentle handling of shear-sensitive fluids and slurries.

Circumferential piston pumps (or rotary piston pumps) are food grade industrial pumps and feature a stainless steel 316 body with rotors constructed from a non-galling “808” stainless alloy aka ‘the metal that slides’. The close-clearance operation of the rotors is critical to the performance of the pump and allows gentle handling of high viscosity, shear-sensitive fluids. We use these pumps for pumping butter & fats, fondants, icing, concentrated pastes, fruit concentrates, wholetail scampi and other fragile or high viscosity materials.

Circumferential piston pumps

The external Circumferential Piston Pumping Principle

The rotor wings (pistons) rotate around the external circumference of the channel in the pump casing. This continuously generates a partial vacuum at the suction port as the rotors un-mesh causing fluid to enter the pump. The fluid is transferred around the channel by the rotor wings and is displaced as the rotor wings re-mesh, generating pressure at the discharge port. Pump output is directly proportional to speed and direction of flow is reversible.

Circumferential piston pump deep rotor channels diagram

Low shear pumping

The deep channels in which the rotors travel provide large voids to minimise shear and bruising of solids with gentle handling.

Circumferential piston pump alloy 808 alloy rotors diagram

High efficiency & accuracy

The non-galling alloy rotors allow extremely tight clearances between rotating and stationery surfaces. This ensures high efficiency and metering accuracy even on thin liquids.

Circumferential piston pump minimise deflection diagram

High Pressures

The forward part of each non-galling rotor rotates in a recess in the pump head to minimise deflection even at high discharge pressures.

Circumferential piston pump suction diagram
Circumferential piston pump discharge diagram

Typical Applications

The reliability of the circumferential piston pumping principle has been proven over many decades and its heavy duty design and easy cleanability make it suitable for all sanitary fluids.

Dairy: milk, cream, curds, butter, soft cheese, yoghurt, margarine, ice-cream

Bakery: yeast, dough, fruit filling, icing, fat, oil

Meats: sausage filling, fat, broth, gelatine, pet food

Canned Foods: potato salad, baby food, soup, stew, tomato, relish, pudding, dressing, mayonnaise, jam, jelly

Beverages: beer, mash, wort, fruit juice, fruit concentrate

Confectionery: liquid sugar, chocolate, cocoa butter, cocoa liquor, corn syrup, gelatine

Flavourings: syrup, concentrate

Dressings: Mayonnaise, prepared sauces

Cosmetics: cream, lotion, jelly, shampoo, emulsion, toothpaste

Industrial: paint, ink, latex, polymer


Designed for ‘Universal’ appeal, our pumps and their component parts are interchangeable with other brands.

  • Pump casing is 316 stainless-steel, interior finished to 3-A standards.
  • Rotors are special non-galling alloy.
  • Twin wing rotors are standard with single wing rotors for large solids optional.
  • Rotors with special clearance available for high temperatures, chocolate etc.
  • One-piece 316L stainless-steel shafts standard on smaller models. High-strength 17-4 PH shafts standard on larger models.
  • Gear case stainless-steel.
  • Helical timing gears minimise operating noise.
  • Seal options include single O-ring seal, single mechanical seal, double O-ring seal with flush or double mechanical seal with flush.
  • Four-way mounting allows horizontal or vertical port orientation and provides mounting flexibility.
  • Bearing retainers are stainless-steel to ensure longer life under harsh cleaning conditions
  • Grease fittings are threaded to prevent accidental removal during greasing.

Circumferential Piston Pump Series

Viking Pump circumferential piston pump TRA10

TRA10 Series

The ‘workhorse’ circumferential piston pump designed to be cleaned out of place.

Interchangeable with Waukesha® Universal 1 pumps and parts.


  • Capacity to 102m³ per hour
  • Pressure to 27 bar
  • Viscosity to 200,000 cPs
  • Temperature -40°C to 150°C
Viking Pump circumferential piston pump TRA20

TRA20 Series

The advanced hygiene circumferential piston pump designed for clean-in-place.

Interchangeable with Waukesha® Universal 2 pumps and parts.


  • Capacity to 102m³ per hour
  • Pressure to 34 bar
  • Viscosity to 200,000 cPs
  • Temperature -40°C to 150°C
Viking Pump Hygienic Revolution lobe pump

Revolution Series

The ultimate circumferential piston pump with all the legacy benefits plus much more.

Same exterior footprint as Waukesha® Universal 1 & 2 pumps. 


  • Capacity to 173m³ per hour
  • Pressure to 31 bar
  • Viscosity to 440,000 cPs
  • Temperature -40°C to 150°C

Waukesha Cherry-Burrell® is a registered trademark of  SPX FLOW Inc.