Alfa Laval DuraCirc Aseptic Circumferential Piston Pump

Introduction

The Alfa Laval DuraCirc Aseptic delivers the perfect balance of

durability, reliability, high efficiency and superior hygienic

performance. Combined with design features enabling simple

service, the DuraCirc Aseptic keeps process running. In additional

to a class leading range of flow and pressure capabilities and

globally recognized hygienic certification, DuraCirc Aseptic

specification allows for a sterile environment to be maintained

within the pump. The innovative design also includes features that

make cleaning and maintenance faster, easier and more

dependable.

Applications

Designed for sterile flushing at all product media to atmosphere

interfaces, as well as Cleaning-in-Place (CIP), the Alfa Laval

DuraCirc Aseptic is ideal for aseptic processing 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 Aseptic Circumferential Piston Pump is available

with 5 different pump head displacements to handle flow rates up

to 103 m3/h and differential pressures up to 25 bar.

Benefits

• Ability to introduce steam barrier on all media/atmosphere

interfaces - front cover, ports and mechanical seals, allows for

sterile pump operation.

• 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 whilst cutting cleaning costs.

• 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.

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 double mechanical seal prepared for sterile

flushing. Furthermore, with special double sealing designs the

pump is prepared for sterile flushing at the port connections and

in the front cover.

The Alfa Laval DuraCirc Aseptic 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.