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3/4" Bronze gear pump

PEO Relief Valve
Model Number
Oberdorfer - N970R-39: 3/4" Bronze gear pump

Oberdorfer N970R-39

3/4" Bronze rotary gear pump with relief valve, close couples to a 1725 RPM motor. PUMP ONLY, Gear Pump End Only (no motor - for Clutch Mounted assembly). Often used to pump Diesel fuel. Pump housings and gears are made of top quality bronze, shafts are stainless steel 303. Bearings are made 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. Shaft speed and flow are directly proportional. Motor HP needs to increase with a increase in pump pressure. The nature of a positive displacement pump. See Chart.

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.

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 32oF to 140oF for longest pump life. If more extreme temperature conditions exist, our factory should beconsulted. 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 size should be at least one size or two sizes larger than the pump inlet port.

More Information
Model Number N970R-39
part number N970R-39
Series N970 Oberdorfer Bronze gear pump 3/4
Max Flow (GPM.) 19
Max Flow GPH 1140
TDH Maximum (Ft) 46
TDH Maximum (PSI) 20
Inlet Connection Type FNPT
Inlet (In.) 0.75
Outlet Connection Type FNPT
Outlet (In.) 0.75
Wetted Materials 304SS, Bronze
Elastomers / O-ring Buna-Nitrile
Speed (RPM.) 1725
Motor Frame 56C
Self Priming Yes
Suction Lift (FT.) 20
Max Operating Temperature (F) 140
Viscosity Glycerine 880.00 cp 5000.00 ssu
Shaft 304SS
Length (In.) 22.5000
Mechanical Seal DBL. LIP SEAL
Mechanical Seal Type Single
Coupling Y
Other Clockwise rotation from pump end. Clutch not included.
Pump Bearing Carbon
Cord Length (Ft.) 0
Drain No
Port Rotation Yes
Country of Manufacture United States
Weight (Lbs) 15.000000
Warranty (YRS.) 1