Rotary-lobe pumps with a high power density
Tornado rotary-lobe pumps (photo) handle almost any substance over a wide viscosity range continuously and gently while metering in proportion to speed. They offer a small space requirement and high power density. These rotating positive-displacement pumps are self-priming, valveless and feature two rotary lobes running in a synchronized fashion. The rotation of the rotors creates a vacuum on the suction side, which draws in the pumped product. The rotors displace the product into the pressure area. Two to six cavities are filled per rotation, depending on the number of rotor blades. This enables metering proportional to rotation speed. Because of a unique spatial separation between the pump and the gear chamber, Tornado pumps also maximize operational reliability. Due to the significant free-ball passage and the low speeds, these pumps are insensitive to blockages, clogging and foreign bodies. Varying solids content has little influence on the flowrate as pressure changes. Booth 3629 — Netzsch Pumps USA, Exton, Pa.