OMAC BE Monobloc Rotary Lobe Pump: A Compact, Low-Cost Solution for F&B

A rotary lobe pump is a type of positive displacement rotary pump: two lobe-shaped rotors rotate synchronously in opposite directions via a timing gearbox, with minimal clearance between them and no contact with each other. As a result, the pump chamber has no mechanical wear and requires no internal lubrication, and the pumped fluid is not contaminated by lubricants.

In the standard configuration, the pump has a baseplate, coupling, and separately mounted motor. The monobloc version simplifies this assembly: the pump body mounts directly onto the standard IEC motor flange, with the pump shaft driven directly from the motor shaft. Eliminating the baseplate, coupling, and separate drive reduces the number of components, lowers weight, and shortens the overall pump assembly length — meaning lower manufacturing and installation costs, with fewer alignment points to check during maintenance.

Within the OMAC (Italy) sanitary rotary lobe pump family, the BE series is the compact monobloc version designed for low acquisition cost. The pump uses bi-lobe rotors and mounts directly onto the IEC motor flange.

The ability to pass solid particles of 10–19 mm allows the BE to handle many types of fluid in food and beverage processing that contain small pieces — something centrifugal pumps typically struggle with. With pressure up to 7 bar, the BE targets general-purpose transfer and feed duties in F&B plants where a sanitary pump is required but cost control is a priority.

The monobloc version is well suited to pump points requiring a compact footprint, a limited budget, and a general-purpose level of pressure and sanitary performance. When higher pressure, lower surface roughness, or more rigorous sanitary certification is required, other versions within the OMAC range should be considered.

Compared to centrifugal pumps — which are suited to thin fluids — rotary lobe pumps preserve the structure of shear-sensitive fluids such as cream, sauce, and yogurt through gentle, low-shear pumping. For very high-viscosity fluids, an eccentric screw pump may be more appropriate; in the range of moderate viscosity, fluids with particles, and a need for a compact sanitary pump, the monobloc BE is a balanced option between performance and cost.

Since the two rotors do not contact each other, the primary wear components of a rotary lobe pump are the mechanical seal and rotor clearances. The monobloc version has the advantage of fewer separate drive components, reducing the number of alignment points and potential sources of vibration. When replacing seals or checking clearances, follow the manufacturer’s technical documentation to maintain correct operating tolerances. The AISI 316L material and sanitary design make the BE well suited to production lines requiring periodic cleaning in the food and beverage industry.