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Design principle Lobe and Piston Pumps

All rotary lobe and circumferential piston pumps are designed according to the same construction principle. Two displacement elements (3) mounted on parallel shafts (1) are supported by an external gearbox (5).

The two displacers (3) turn in opposite direction with minimal radial and axial clearances. They neither touch each other nor the surrounding pump casing. The shafts are synchronized by spur gears. (4)

The displacers (3) are shaped so that they seal the suction chamber against the pressure chamber in any position. This sealing is only achieved by the gap, not by additional seals or valves. The removable pump cover (2) seals the pump housing and allows easy access from the front.

Working principle Lobe and Piston Pumps

1. The volume at the inlet increases when the rotors rotate, and the product is aspirated into the pump

2. The liquid is transported between rotor and casing (chamber) through the pump

3. The volume is reduced between the rotors and the product is forced out through the outlet 

What are the benefits of Lobe and Piston Pumps

These positive displacement pumps are perfectly suited for pumping hygienic products with higher viscosities. When the product becomes more viscous, the efficiency of this pump also increases. 

This lobe pump technology has the greatest flexibility regarding the shape of the rotor in function of the product to be moved. They can be equipped with a single-, double-, tri-, multi-, piston circumferential- or helical lobe. The single and double lobes can be used when a larger free passage is required, while the trilobes and multilobes come into play for the more dosing-oriented applications. The Helilobe in turn guarantees a pulsation-free operation, low NPSHr and the flexibility to work with high and low viscosity at different speeds, all in a nice TCO jacket.

Besides these standard stainless steel versions (316L), rubber rotors are also available which find their application in the wine industry or also alloys which allow a metallic contact between rotor and pump casing without damage (non galling rotors).

What are the benefits of Packo Lobe and Piston Circumferential Pumps

With the configure to order principle, the Packo lobe and piston circumferential pumps can be complete executed to the customer's wishes. Multiple connections, seal configurations and various elastomers applicable. 

A fast delivery time is possible by applying a priority order, whereby the configured-to-order principle can be applied but with a shorter delivery time.

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