While standard centrifugal pumps are typically used for mixing, blending and transporting product from points A to B, moving product with minimal shearing requires a positive-displacement (PD) pump. PD pumps can move food and beverages with a minimum of shear because the product is moved, in the case of a rotary PD pump, within the rotor pockets from the inlet to the outlet.

Shear, the relative motion between adjacent layers of a moving liquid, affects different liquids in different manners. Paint thins in viscosity as it is stirred; but cornstarch and water thicken when sheared. With a low-shear pump, delicate soups can be transported from the kettle to the filler, keeping food particles intact, and yogurt can be moved in a dairy without subjecting it to shear that may cause it to separate later after packaging.

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2012-07-31

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