During operation, the main screw rotates to move the chambers in a continuous, axial direction. Because the volume of each chamber remains constant, the pump delivers a steady, uninterrupted flow along its entire length. The resulting axial thrust is fully counterbalanced by a compensating piston, ensuring smooth operation. The driven screws are supported by bearings located in the discharge section and are only partially balanced. The internal forces between components vary depending on the viscosity of the medium being pumped.
Triple Screw Pumps
Triple Screw Pumps have three screws – a drive screw and two driven screws – meshed inside the pump casing forming transfer chambers. Turning the drive screw moves the chambers continuously in an axial thrust.
The screws are in contact with each other as well as the pump casing, so they must always be lubricated. There are five Triple Screw Pump models.