Progressive Cavity Pumps

Progressive cavity pumps have a unique design that makes them a good selection for many challenging conditions that are experienced on groundwater remediation sites. Progressive cavity pumps are also called Eccentric Screw Pump which describes the motion and shape of the pump rotor.

The pumps steel rotor presses tightly against the flexible stator creating sealed cavities that progress towards the discharge port with each rotation of the rotor. This progression of the fluid through sealed cavities allows the pump to operate against a high vacuum making it ideal for high vacuum extraction sites.

Unlike other pumps that use impellers to force the fluid forward, the progressive cavity pump does not cause mixing or shearing of the fluid. This makes progressive cavity pumps ideal for sites with free product because the fuel and water remain separated rather than being mechanically emulsified. Emulsified fluids severely reduce the effectiveness of oil water separators, air strippers and even carbon treatment. The progressive cavity design also allows the pumping of suspended solids and viscous fluids without creating the fouling or maintenance issues that limit other types of pumps.