Alfa Laval SX Rotary lobe pumps

Introduction

The Alfa Laval SX Rotary Lobe Pump is designed with optimized

pump head geometry and multi-lobe rotors to ensure low-shear

operation with minimum pulsation. This makes the SX the best

choice for maintaining the integrity of delicate products.

The pump is designed according to the most stringent hygienic

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

(CIP) and Sterilization-in-Place (SIP).

Applications

The SX Rotary Lobe pump is designed for gentle transportation of

process fluids in hygienic and ultra-clean applications in the

biotechnology and pharmaceutical industries, in the home and

personal care sector, and for demanding food applications.

The SX Rotary Lobe Pump is available with 14 different pump

head displacements based on seven different gearbox modules to

handle flow rates up to 115 m3/h and differential pressures up to

15 bar.

Benefits

• Low pulsation and very gentle pumping, making the pump

ideal for sensitive products.

• Minimized shearing for protecting end-product quality.

• Low maintenance, increased process uptime.

• Maximized performance and minimized risk of contamination.

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 SX has four-lobe rotors rated to 150°C,

facilitating use with CIP and SIP processes.

Fully front-loading and fully interchangeable single, single flushed,

and double mechanical shaft seals are available. All media

contacting elastomers are controlled compression joints, the

latest technology where static and dynamic elastomer seals are

used to prevent leakage of pumped media to the atmosphere.

The Alfa Laval SX 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 multi-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.