Screw Pump

shape of a single external helix, rotates around its on axis in the direction of rotation (say clockwise); while the axis of the rotor, revolves in the opposite direction (say anticlockwise) around the axis of the stator. The stator is made of and elastomeric bonded to end alloy steel tube. The stator itself is in the shape of an internal double helix. The rotor is contained within the stator and forms a continuous seal along the length of the stator. The above movement produces cavities at reduced pressures which move axially from the inlet to the outlet conveying the fluid at fixed flow rate proportional to the rotational speed.