Alfa Laval SRU Rotary lobe pump

Introduction

The Alfa Laval SRU Rotary Lobe Pump is a reliable positive displacement

pump for the gentle handling of sensitive process fluids. The pump is

carefully engineered to provide reliable performance, trouble-free

operation and superior energy efficiency for demanding applications.

It is an excellent choice for duties that require contamination-proof pumps

to meet high standards of hygiene, low-shear and low-pulsation operation.

The pump is designed according to the most stringent hygienic design

standards and with verified, effective Cleaning-in-Place.

Applications

The SRU Rotary Lobe Pump is designed for gentle handling of sensitive

process fluids across the dairy, food, beverage, brewing, chemical,

pharmaceutical, and home and personal care industries.

Its smooth, low-shear pumping action makes the pump suitable for

handling media of varying viscosities, whether low or high-from creams,

gels, emulsions, and aerated mixtures to delicate cells and organic solids

in suspension.

The SRU Rotary Lobe Pump is available with 12 different pump head

displacements based on six different gearbox modules to handle flow

rates up to 106 m3/h and differential pressures up to 20 bar.

Benefits

• Consistent performance.

• Minimal risk of contamination.

• Low maintenance, increased process uptime.

• Modular design for greater flexibility to configure exactly the right solution

for specific process requirements.

Standard design

All media contacting steel components, like the rotor case, front cover, rotors

and rotor nuts, are in W. 1.4404 (AISI 316L).

The robust stainless steel gearbox provides maximum shaft rigidity and easy

oil seal replacement. The gearbox design is universal, which enables the

flexibility of mounting pumps with the inlet and outlet ports in either a vertical

or horizontal plane by changing the foot and its position.

The standard Alfa Laval SRU Rotary Lobe Pump has tri-lobe rotors. Optional

bi-lobe rotors for handling fluids containing large delicate solids are available.

All rotors are available in three temperature ratings enabling the pump to be

operated at maximum process temperatures of 70°C, 130°C and 200°C for

both fluid pumped and CIP.

Single, single flushed, and double mechanical shaft seals as well as packed

gland, unflushed or flushed, are available.

The Alfa Laval 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.

Working principle

A gear train in the pump gearbox drives the rotors and provides accurate

synchronization of the tri-lobe rotors. The movement of the counter-rotating

rotors creates a partial vacuum that allows 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.