All the components subject to wear are contained in a cartridge
unit that can be easily removed for inspection and/or replacement
without disconnecting the pump from the circuit, drastically
reducing expensive machine down time. The cartridge contains
a rotor, vanes and inserts, a cam ring and two covers.
During operation the rotor is driven by a splined shaft
coupled to the drive unit. As the rotation speed increases,
centrifugal forces, in combination with the pressure generated
behind the vanes, push the vanes outwards, where they follow
the profile of the cam of the ring with a sufficient contact
pressure to ensure adequate hydraulic sealing. The two opposed
pumping chambers formed by the elliptical profile of the cam
cancel out radial loads on the shaft bearings, thereby giving
them extremely long lifetimes.