Alfa Laval SRU

  • 12 different pump options to fit process’s needs
  • Ideal rotary lobe pump for gentle handling of sensitive products
  • Reliable & trouble free operation
  • Superior energy efficiency

With its smooth, low-shear pumping action, the SRU is Alfa Laval’s go-to rotary lobe pump for the gentle handling of sensitive process fluids within the dairy, food and beverage, biotechnology and pharmaceutical industries.


Dependable & Energy Efficient


Alfa Laval’s SRU rotary lobe pumps are designed to deliver reliable performance, trouble-free operation and superior energy efficiency. It is an excellent choice for duties that require contamination-proof pumps to meet high standards of hygiene, low-shear and low-pulsation operation. This EHEDG-approved pump handles both Cleaning in Place and Sterilization in place, and can be supplied with thorough documentation to support rigorous validation requirements.


Reliable Performance, No Contamination Risk


SRU rotary lobe pumps are engineered with features that maximize performance and minimize the risk of contamination. Features include a defined compression front cover sealing, rotor nut retention design, drainable pump head and ultra-clean surface finishes.


Protect Product Quality


Understanding of flow patterns is critical to deliver high efficiency fluid transfer with low pulsation, low shear and low noise characteristics. Alfa Laval employs Computational Fluid Dynamics (CFD) to establish exact geometry for the rotors and rotor case for the SRU pump.


Extreme Flexibility


The modular design of the SRU provides extreme flexibility to configure precisely the right solution for specific application requirements.


To match various process requirements, the SRU features an R90 external shaft seal, which can be specified in various materials and configurations in order to guarantee the correct shaft seal for the application. The  SRU can also be fitted with Hyclean mechanical seals as well as other seal solutions.


The broad range of models and capacities available in horizontal or vertical porting, the SRU has a wide selection of options, including:


  • standard and custom seals,
  • heating/cooling saddles and jackets,
  • an integrated pressure relief valve and a
  • rectangular inlet for pumping high viscosity fluids.


Simple Maintenance & Solid Construction


To ensure reliable operation and minimal maintenance the SRU features a robust gearbox construction with heavy-duty shafts, torque locking assemblies and taper roller bearings throughout. The pumps operate with no internal contacting parts in the pump head.


The SRU can be supplied either as a bare shaft pump or mounted on a base plate complete with coupling, guard, gear motor and shroud for easy plug-and-play installation. Standard materials of construction are 316L stainless steel for all wetted parts and painted cast iron for the gearbox. Other materials are available on request.


SRU Pump Range & Specifications


The SRU range is available with twelve different pump head displacements, flow rates up to 106 m³/h, differential pressures up to 20 bar, temperatures up to 200°C and port sizes from 25 to 150 mm in diameter.


Alfa Laval SRU rotary lobe pumps comply with EHEDG, 3-A, 3.1 and FDA hygienic standards and have ATEX approval for use in explosive environments.


Operating Principle of the Rotary Lobe Pump


The motion of the counter-rotating rotors creates a partial vacuum that permits atmospheric pressure or other external pressures to force fluid into the pump chamber. As the rotors revolve, an expanding cavity forms, filling with fluid. As the blades disengage, each dwell forms a cavity. As the rotor blades engage, the cavity diminishes and fluid is, displaced into the outlet port.


Count on Rodem and Alfa Laval pump specialists to help tackle your next pump challenge.



Speak with a Rodem representative to learn more about Alfa Laval SRU positive displacement pumps today by completing our online form or calling us at 800-543-7312.