How Do Screw Channel Pumps Work?

Screw centrifugal pumps combine the classic centrifugal pump principle with a special screw-shaped impeller geometry.

The large screw channel at the front of the impeller ensures that the fluid is gently drawn into the pump housing. This structure allows the flow to proceed in a laminar manner and solid particles or viscous fluids to be transferred without fragmentation.

When the pump is running, the screw-shaped vane profile directs the fluid axially from the inlet to the impeller and then accelerates it radially with centrifugal force, transferring it to the discharge line. This design achieves both high efficiency and a low NPSHr (Net Positive Suction Head required) value. The low NPSHr value reduces the risk of cavitation, increasing system reliability.

Thanks to the open impeller structure, large solid particles or fibrous materials can be easily pumped.

This feature provides a great advantage, especially in wastewater, food, sludge, biomass, and viscous chemical applications.

In addition, the smooth flow reduces energy consumption and lowers operating costs.

This type of pump, as in the Verderhus series, stands out with its high hydraulic efficiency and low maintenance requirements in processes requiring gentle transfer of high solids content or viscous fluids.