Positive pumps

Positive pumps


For transporting raw materials, semi-finished products and end products during the production process.


In nearly every food manufacturing company raw materials, semi-finished products and end products are conveyed using pumps. Pumps are also being used for dosing.


Positive displacement means that a portion of fluid is sucked in and discharged. A pulsating flow is also possible.


There are different types of positive pumps:


Lobe pump: Per rotation a certain volume is being pumped. The pressure is relatively low. Applicable both for low and high viscous fluids, even when these contain solid particles.


Mono screw pump: A screw-shaped rotor moves in a rubber casing (stator). The rotor moves to-and-from and presses away fluid axially. The rotor is driven by a propeller shaft. This type of pump is excellent for dosing with little pulsations. However, it cannot run dry.


Membrane pump: A membrane is moving to the lowest point creating low pressure and through inlet valves fluid enters the cylinder. When the membrane reaches the highest point, the fluid is pumped through outlet valves. This causes the outlet flow to pulsate. The membrane can be driven by motor, by air or by oil. This pump type functions hygienically, it has no problems when running dry and it can be used to dose. The quality of the membrane determines the durability of the pump.

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