Alfa Laval DuraCirc Circumferential Piston Pump

Introduction

The Alfa Laval DuraCirc delivers the perfect balance of durability,

reliability, high efficiency and superior hygienic performance.

Combined with design features enabling simple service, the

DuraCirc keeps process running. In additional to a class leading

range of flow and pressure capabilities, DuraCirc comes with

globally recognized hygienic certification. The innovative design

also includes features that make cleaning and maintenance

faster, easier and more dependable.

Applications

Designed for Cleaning-in-Place (CIP), the Alfa Laval DuraCirc is

ideal for hygienic applications within the dairy, food, beverage,

home and personal care industries. The highly efficient design is

particularly suited to applications that are low in viscosity with

medium to high discharge pressures and require equipment that

can be cleaned in place.

The DuraCirc Circumferential Piston Pump is available with 13

different pump head displacements to handle flow rates up to 149

m3/h and differential pressures up to 40 bar.

Benefits

• High volumetric efficiency performance allowing for optimized

pump selection, reducing capital cost, whilst improving

process yield.

• Certified to both EHEDG and 3A, reducing both process cross

contamination risk and CIP cycle time, maintaining process

yield as well as cutting cleaning costs.

• Truly front-loading single seal, full component

interchangeability without complicated maintenance

procedures, long life bearing operation and one single long-life

lubricant making service faster and easier, increasing process

uptime.

• Robust, durable design via strong gearcase incorporating

increased diameter shafts and optimally positioned heavy

duty bearings, minimizes risk of pump head contact, reducing

service requirement, maintaining process continuity.

• DuraCirc Uni-Fit port option allows easy direct replacement of

both Alfa Laval SCPP range and also other major brands into

existing process systems, without changing pipework.

Standard design

Twin-wing piston rotors made of special non-galling alloy are

standard. All other media contacting steel components, like the

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

With stainless steel gear case and feet, the DuraCirc pump has

an all stainless steel exterior, making it exceptional corrosion

resistant.

The gearbox is as standard designed with duplex shafts and a

strong, long life bearing arrangement. This provides for a very

robust and rigid shaft assembly design – a prerequisite for the very

high volumetric efficiency achieved.

With profiled defined compression elastomers and an optimised

shaft seal location, the DuraCirc is designed according to the

most stringent hygienic design standards and with verified and

effective CIP cleanability.

The pump features a front-loading single mechanical seal, which

allows quick and easy inspection or replacement without the

need to disassemble pipework. Single flushed and double

mechanical shaft seals as well as O-ring seals are available as

options.

The Alfa Laval DuraCirc 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

The rotor pistons rotate around the circumference of the channel

in the pump casing. This continuously generates a partial vacuum

at the suction port as the rotors unmesh, causing fluid to enter the

pump. The fluid is transported around the channel by the rotor

pistons, and is displaced as the rotor pistons re-mesh, generating

pressure at the discharge port. The direction of flow is reversible.