This is a unique hydraulic pump designed and patent protected by Dr. George F. Round, Professor Emeritus, McMaster University, Hamilton, Ontario, Canada.
The pump is unique in that it produces high volume and high pressure simultaneously.
The GERO pump grew out of the original concept of a pump that would combine the best characteristics of a centrifugal pump with flat head - flow rate curves, with some of the characteristics of a gear pump. The intent was to design a pump that would develop high pressures and high flow rates simultaneously.
The result has been a prototype GERO pump with two rotors rotated by a single drive shaft.
The GERO pump is a pure rotary positive displacement pump that has been designed as a high pressure liquid, or conversely as a vacuum pump. A small prototype GERO pump with rotors made of 316-S stainless steel with a body made of aluminum has been extensively tested at discharge pressures of up to 1,000 kPa and rotational speeds of up to 1,500 rpm. Short experimental runs have been made at 4,500 rpm (about 2,300 kPa). The GERO pump has the smallest size/flow rate ratio of any existing pump. Because of the balanced purely rotational design of the pump, it is very quiet and almost completely vibration free.
| Piston Pump | Vane Pump (Flexible Vanes) | Vane Pump (Rigid Vanes) | Gear Pump | GERO Pump | |
| Pressure | High | Low | Medium | Medium-High | High |
| Flow and Size | Low | Medium | Medium | Low | High |
| Friction | Medium | High | Very High | Medium | Low |
| Reliability | Good | Poor | Good | Good | Good |
| Vibration and Noise | Poor | Medium | Medium | Medium | Very Low |
Potential applications for the GERO pump include:
