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Cooling Gear Pump w/ relief valve

Heliarc Welding
Model Number

Oberdorfer N1000R39

Heliarc Welding machine cooling Pump. Bronze Pedestal Gear pump with relief valve. Often used as a coolant pump on welding torch, Miller welder heli-arc. Pump flow is reversible. Round body "no feet body".
  • 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.
  • Maximum shaft speed is 1750 rpm.
  • Recommended pressure limits are 100 psi for water and non-lubricants, 150 psi for oil and lubricants.
  • A relief valve is a necessary in the system if the discharge line contains any throttling devices, such as a shut-off valve, a spray nozzle or other restrictive device. This will return the liquid to the suction side or to the tank. However, built-in relief valves are only good for intermittent service. If used continuously, the pump will over heat. A built-in relief valve is strictly a safety device against overpressure. It will not work successfully as a pressure or flow control device. For this purpose a separate relief valve in the pressure line must be used.
  • Service life will be increase substantially if the liquid pumped is clean and has a lubricity value. These pumps have extremely close tolerances.
  • Pump housings and gears are made of top quality bronze
  • Shafts are from stainless steel 303
  • Bearings are designed of high performance carbon-graphite material selected for wear resistance and long service life.
This pump has shaft lip seal.
More Information
Model Number N1000R39
part number N1000R39
Series N Oberdorfer Gear Pumps Bronze
Max Flow (GPM.) 2
Max Flow GPH 120
TDH Maximum (Ft) 243
TDH Maximum (PSI) 100
Inlet Connection Type FNPT
inlet size Less than 1"
Inlet (In.) 0.25
Outlet Connection Type FNPT
Outlet (In.) 0.25
Wetted Materials 304SS, Bronze
Elastomers / O-ring Buna-Nitrile
Speed (RPM.) 1725
Self Priming Yes
Suction Lift (FT.) 20
Max Operating Temperature (F) 350
Viscosity Glycerine 880.00 cp 5000.00 ssu
Shaft 304SS
Mechanical Seal LIP
Mechanical Seal Type Single
Coupling Y
Other Shaft Size: 1/2". Relief valve factory set at 50 PSI. Pump is bi-rotational or reversible. Reversing the rotation reverses the In Outlet ports and the location of the by-pass port has to be reversed. 32133 is drive gear and 32118 is idler gear parts. 11187 is the pump repair kit.
Pump Bearing Carbon
Drain No
Port Rotation Yes
Country of Manufacture United States
Weight (Lbs) 5.000000
Warranty (YRS.) 1

Supporting Docs

Supporting Docs
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