The pumping elements are rotor and stator. The single helical rotor rolls eccentrically in a double threaded helix stator of twice the pitch length.  A series of sealed cavities 180° apart are created that appear to progress from suction to discharge during one rotation of rotor.  The opposing cavities fill and empty simultaneously resulting in a pulsation less flow.  The fluid travels axially with relatively low velocity and minimal agitation.  The stator is made of a resilient elastomeric material and bonded to the stator tube.  The important feature of the pumping principle is the ability to handle slurries and solid particles. The elastomeric stator also permits passage of solid particles due to elastomeric deformation.

The pumping elements are rotor and stator. The single helical rotor rolls eccentrically in a double threaded helix stator of twice the pitch length.  A series of sealed cavities 180° apart are created that appear to progress from suction to discharge during one rotation of rotor.  The opposing cavities fill and empty simultaneously resulting in a pulsation less flow.  The fluid travels axially with relatively low velocity and minimal agitation.  The stator is made of a resilient elastomeric material and bonded to the stator tube.  The important feature of the pumping principle is the ability to handle slurries and solid particles. The elastomeric stator also permits passage of solid particles due to elastomeric deformation.