The SRU is Alfa Laval’s core rotary lobe pump. In addition to handling the widest range of temperatures and pressures, SRU pumps offer the most extensive options in our rotary lobe pump portfolio. Their heavy-duty construction and unparalleled flexibility make them an engineered solution for the most demanding applications.

Among the many SRU options are saddles and jackets for heating/cooling the pump head and an integrated pressure relief valve and rectangular inlet for pumping high viscosity fluids. A wide selection of standard seal options is available, together with proprietary seals to suit most applications.

There are tri-lobe and bi-lobe rotors to choose from, which can be manufactured from various materials. Bi-lobe alloy rotors can be used for closer tolerances and higher efficiencies on low-viscosity products.

Higher surface finishes up to 20 Ra are also available, as well as electro-polishing.
Unit of Measure


Our rotary lobe pumps are ideal for both Cleaning in- Place (CIP) and Sterilization-in-Place (SIP) applications.
Easy Seal Retrofit
The seals of our rotary lobe pumps are designed for quick and simple upgrading. Our broad range of seals includes many seal types and configurations, which can be tailored to your need and application.
Gentle, Hygienic Design
With their high-precision rotors and low-shear operation, our rotary lobe pumps ensure the gentle movement of delicate products. The pumps offer a number of features that maximize clean ability, and their construction provides compliance with the world’s leading hygienic standards.
Heavy Duty Gearbox Construction
Our rotary lobe pumps are fitted with a cast iron gearbox incorporating heavy-duty taper roller bearings and torque locking assemblies that allow for easy maintenance and high reliability. The pump rotors are driven by a high-precision involute spline drive.
Improved Drainability
All of our rotary lobe pumps can be drained easily when mounted in vertical port position. In the case of our OptiLobe and SX pumps, cusps are retained in vertical configurations for greater efficiency.
Modular pump design
Our rotary lobe pumps feature a modular construction. This design feature increases flexibility and reduces spare parts inventory.
Standards and Approvals
All of our rotary lobe pumps are compliant with the EHEDG, 3A and FDA hygienic standards. In addition, our SX and SRU pumps have approval for use in explosive environments.
Universal Mounting
To allow high flexibility when fitting the pump into a production line, all of our rotary lobe pumps can be mounted in either a vertical or horizontal port position (with the exception of the larger SX models) .