N991 Bronze Gear Pump

Oberdorfer Pumps has been manufacturing high-quality, dependable pumps for over 100 years. We manufacture gear pumps, centrifugal pumps, rubber impeller pumps, progressive cavity pumps, and roller pumps. Positive displacement BRONZE gear pumps. Little flow decrease with pump pressure increase. Flow increases with speed increase. Flow from 1-175 GPM (3 - 662 LPM)and pressures from 0-150 PSI (0 - 10.3 BAR). Pump housings and gears are made of top quality bronze, shafts are 303 stainless steel. Bearings are designed of high performance carbon-graphite material selected for wear resistance and long service life. Gear pumps are positive displacement pumps. Each shaft revolution displaces a definite amount of liquid relatively unaffected by the back pressure in the discharge line. Shaft speed and flow are directly proportional. Recommended pressure limits are 50 PSI for water and non-lubricants, 75 PSI for oil and other lubricants.The maximum shaft speed is 1725 RPM. As a general rule, the suction lift should be kept at an absolute minimum by placing the pump as close to the liquid source as possible. A gear pump in new conditioncan lift 20 feet of water in the suction line. A foot valve (preferably with built-instrainer) is recommended at the beginning of the suction line. For a first start-up, thepump should be primed to avoid dry running. Minimum size of the suction pipe is thesize of the pump inlet port. For longer suction lines (over 3 feet) or for viscousliquids, the pipe should be at least one size or two sizes larger than the pump inletport.