A screw pump (also known as a progressive cavity pump) is a type of positive displacement pump that moves fluid through the action of a rotating helical screw (rotor) inside a stationary stator. It generates a smooth, non-pulsating flow, making it ideal for handling viscous, abrasive, or shear-sensitive liquids.
Positive Displacement → Traps and moves fixed volumes of fluid per rotation.
Helical Rotor & Stator → The rotor (single helix) rotates inside the stator (double helix), creating sealed cavities.
Low Shear → Gentle pumping action, suitable for delicate fluids (e.g., food, polymers).
Self-Priming → Can evacuate air and draw fluid without external priming.
Handles High Viscosity → Effective for thick fluids (e.g., oil, sludge, syrup).
The rotor turns eccentrically inside the stator, forming progressing cavities.
Fluid enters the suction side and gets trapped in these cavities.
As the rotor rotates, the cavities move toward the discharge side, pushing the fluid out.
Single-Screw Pump (Progressive Cavity Pump) → 1 rotor + 1 stator (most common).
Twin-Screw Pump → Two intermeshing screws (for higher flow rates).
Triple-Screw Pump → Three screws (used in high-pressure oil systems).
Oil & gas (crude transfer, fuel injection)
Wastewater treatment (sludge pumping)
Food processing (chocolate, syrup, dairy)
Chemical industry (polymers, adhesives)
Would you like a more technical breakdown or a comparison with other pump types?
The above content is compiled and published by Zhilong Drum Pump supplier, please specify, to buy oil drum pump, electric drum pump, high viscosity electric drum pump, fuel drum pump, food grade drum pump and so on, please contact us.