Progressing cavity pumps in the production of dry pet food


Courtesy of ALLWEILER GmbH

Progressing cavity pumps from Allweiler AG have been standard equipment in food and beverage production for many decades. With stators and gaskets made of foodgrade materials, CIP and SIP configurations (Cleaning in Place, Steaming in Place), and stainless steel casings and rotors, these pumps are well suited for a variety of applications. For the plant operator, it is also important that cleaning can take place during ongoing operation. This saves time and makes it easier to perform cleaning tasks at short intervals because it is not necessary to empty the system and disassemble the pumps. But ultimately, of course, the pumps must be designed to handle the specific properties of the liquids they are moving. Common examples of liquids include viscous syrups, honey, and marmalade; foaming liquids; and liquids with sensitive solids like fruit yoghurt.

In all of these situations, the pumping systems must work without leaving behind residual material and with complete chemical and bacterial neutrality. In addition, abrasive or pasty liquids may not cause scoring and abrasion of external materials. Only special design solutions can fulfill both of these requirements. Gear pumps, for example, are unsuitable for use with abrasive and/or pasty liquids because they wear quickly at higher capacities, causing contamination of the liquid. Pumps constructed of anything other than high-grade stainless steel are also unsuitable for food-related applications. The surfaces of any metallic components that will come into contact with sensitive pumped liquids may be constructed only of stainless steel and must exhibit a smoothness (and lack of porosity) that will prevent residuals of the pumped liquid from depositing on the surface.

Economical and flexible
These pumps move liquids economically, uniformly, gently, and with low pulsation. Even fibers and solid particles will not interrupt operation. They can tolerate liquids with larger grains and longer fibers without limitation or loss of performance. Capacity is infinitely adjustable by altering speed. Typical applications include dosed additions of ingredients during batch or continuous processing, use in filling systems, introduction of additives, generating product mixtures, or any other situation where exact portions must be measured.

One example of such pumps are the progressing cavity pumps from Allweiler AG. The hydrodynamic shape of the pump’s internal space ensures that there will be no dead spaces (where the product does not flow) during cleaning. This characteristic also prevents the formation of deposits within the flow area. As a result, the pump can be cleaned without leaving behind any residual material. These progressing cavity pumps are self-priming and can be cleaned without residuals using the CIP method.

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