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Eccentric Disc Pumps Are an Efficient Alternative to Traditional Lobe Pumps

Contributed by: PumpScout Staff

Many plants choose traditional rotary lobe pumps and external circumferential piston pumps, but most of these products fall short in food production plants. Food processors often face leftover product and equipment that cannot meet demand. A solution to these challenges is the eccentric disc pump because it can maximize production rates and minimize ancillary costs.

Lobe pumps experience continual wear because the rotation of the lobes forces pumped material to flow around the interior of the pump cavity. The internal clearances in the pump housing become larger over time causing reduced flow capacity, which ultimately increases the likelihood of product slip. They are also unable to adequately strip lines when the pump is used to transfer different products.

These pumps have two shafts that have to be sealed, which doubles the number of areas where leaks can occur. Vertical porting can result in as much as a 25 percent decrease in volumetric consistency. The pumps aren’t self-priming and they do not have lubricated seals.

Eccentric disc pump technology utilizes the eccentric movement principle. The design features a disc in the pump cylinder that is driven by an eccentric bearing on the pump shaft, creating four distinct pumping chambers. This movement produces suction and discharge pressures that ensure fluid passes through the pump at a constant and regular flow rate while preventing pulsing, cavitation, slip, and shear.

Some eccentric disc pump models can pump air without the need for fluid, creating a vacuum effect on the suction side and a compressor effect on the discharge side. Even if the product runs out, the eccentric disk technology will continue to pump air in a constant manner so surface tension is not broken.

They also offer outstanding product recovery. Instead of simply reducing energy expenditures, eccentric disc pumps utilize product recovery capabilities of 70 percent and more. More than 95 percent can be recovered on the suction side, while 60 to 80 percent can be recovered on the discharge side.

Source: Pumps & Systems