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.