This type of pump is a positive displacement pump used for transferring fluids. It operates on the principle of a single helix rotor rotating eccentrically within a double helix stator. This rotation creates a series of progressing cavities that move fluid from the suction end to the discharge end of the pump. An example application is the transfer of viscous fluids or fluids containing solids, where other pump types might struggle.
The significance of this pump technology lies in its ability to handle a wide range of fluid viscosities and compositions. Its consistent flow rate, even against varying pressures, makes it suitable for applications requiring accurate dosing or metering. Historically, this design has found use in industries such as wastewater treatment, food processing, and oil and gas due to its gentle handling of shear-sensitive fluids and its self-priming capabilities.