All of our Dry Pit/bearing frame pumps incorporate the screw centrifugal impeller, invented by Hidrostal. This hydraulic design offers considerable benefits over conventional centrifugal pumps.

• Solids handling
• Viscous pumping
• Delicate handling
• Low shear pumping
• High efficiency operation

The impeller has a single spiral vane having large open passages and an extended turn from the axial to the radial direction.

These features give a combination of characteristics not found in any other type of pump, namely:

• Extremely steep and stable curve
• High efficiencies
• Non-overloading power curve
• Low NPSH
• Non-clog pumping

The term “Non-Clog” has almost become a punchline in the pumping industry.  Traditional wastewater pumps are actually classified as “Non-Clog”, but ask any operator or pump mechanic if their “Non-Clog” pumps clog!  The Hidrostal design takes solids handling operation to the next level, where clogging & blockages are a thing of the past.  The Hidrostal is not a traditional non-clog pump, but actually a hybrid that utilizes the best features of a positive displacement type screw pump – crossed with a single vane centrifugal pump.  This combination provides an unmatched performance of effectiveness & efficiency.