Single-stage centrifugal process pumps, available in a variety of constructive materials to suit various applications and equipped with single, double or cartridge mechanical seals. The pumps are characterized by a different execution of the impeller; ULN pumps, in fact, have a close type impeller, while UHN pumps are equipped with a special impeller that combines a traditional impeller with blades and axial inducer. These pumps are suitable for applications in food, chemical, canning industries and desalination plants. They can convey very viscous fluids, even non-newtonian ones. For applications on food evaporators, pumps ULN and UHN can be internally polished.