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Oberdorfer N999 Bronze Gear Pump

Oberdorfer N999, max flow 1 gpm, inlet size 1/4 in, NPT inlet/outlet connection type, Lip Seal seal type, 0.22 horsepower, No relief valve.
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Notes OBERDORFER N999 BRONZE GEAR PUMP with Buna Lip Seal and BSPT Ports.
Weight (lbs) 5
  • Pump housings and gears are made of top quality bronze, shafts are 303 stainless steel. Bearings are designed of high performance carbongraphite 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 100 PSI for water and non-lubricants, 150 PSI for oil and other lubricants. The maximum shaft speed is 1750 RPM

    • Rugged corrosion resistant bronze construction
    • Compact close-coupled design
    • Stainless steel shafts
    • Durable bronze spur gears
    • Process lubricated carbon graphite bearings
    • O-ring cover seal for maximum leak protection
    • Nitrile Lip Seal -standard
    • Easy field assembly to a variety of motor frames
    • For compact AC motor pump units - see Close Coupled Bronze Adapterless Rotary Gear Pumps
    • For mechanical seal styles - see carbonator style - model N95060

    Close coupled pumps are mounted directly to the electric motor by means of a suitable adapter bracket.  The pump drive shaft is connected to the motor shaft by the flexible coupling.


    These pumps are suitable for all liquids that are compatible with bronze. Most common liquids are water, oil, and mild chemicals in the pH range of 4 to 11. Viscous liquids require reduced shaft speeds of 1150 RPM or lower. (Consult factory.) Liquids containing solids, abrasives, powders, or paint pigments are definitely not recommended for gear pumps. If abrasives are unavoidable, use a very low shaft speed. The recommended liquid temperature range is from 32o F to 140o F for best pump life. If more extreme temperature conditions exist, factory should be consulted. Freezing of water-filled pumps can cause damage and must be avoided. Oils at low temperatures are very viscous requiring a lower speed or extra power. 


    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 condition can lift 20 feet of water in the suction line. A foot valve (preferably with built-in strainer) is recommended at the beginning of the suction line. For a first start-up, the pump should be primed to avoid dry running. Minimum size of the suction pipe is the size of the pump inlet port. For longer suction lines (over 3 feet) or for viscous liquids, the pipe should be at least one size or two sizes larger than the pump inlet port.