Oberdorfer catalog # N993R-C81, Bronze Gear Pump and Motor unit with built in Internal Relief Valve, Bronze construction, Bronze Gears, Stainless Steel Shaft, Buna Lip Seal. Motor is 1/4 Horsepower, 1200 RPM, 12 Volts DC, TEFC (Totally Enclosed Fan Cooled).
Price : $ 1695.00
The Oberdorfer N993R-C81 is a Bronze Gear Pump and Motor unit with built in Internal Relief Valve, Bronze Gears, Buna Lip Seal, coupled to a 1/4 Horsepower, 1200 RPM, 12 Volts DC, TEFC (Totally Enclosed Fan Cooled) Motor. This gear pump can pump most common liquids, and is suitable for water, oil, and mild compatible chemicals in the pH-range from 4-10, as well as diesel fuel. The close tolerances of the gears in this pump require clean liquids with no abrasives, as abrasives will wear down the pump and cause poor performance. Gear pumps are positive displacement pumps and each shaft revolution displaces a definite amount of liquid relatively unaffected by the back pressure in the discharge line. The shaft speed and flow are directly proportional, as the flow increases with speed increase, and the power demand (horsepower) increases with shaft speed and discharge pressure. This pump is self-priming, and the maximum suction lift for this pump is 20 feet, however, the suction line should be as short as possible. A relief valve is necessary to protect the pump and system if the discharge line becomes blocked or closed. This pump has an integral built-in relief valve which is not intended to be a metering or flow control device. Its main purpose is to function as a discharge pressure relief when the spring tension is exceeded by the discharge pressure causing it to bypass internally. The relief valve is always on the discharge side in this pump series. The factory pressure setting on this relief valve is 50 PSIG. To increase bypass pressure, just turn the relief valve adjusting screw in a clockwise direction. This pump is equipped with a BUNA lip seal with a metal case, that are spring energized, and single lip type. These are intended to provide minimum friction drag with positive sealing. These lip seals are easily replaced by pressing out the old seal and pressing in a new replacement. The pump has an O-ring cover seal for maximum leak protection. The bearings in this pump are designed of high performance carbon-graphite material selected for wear resistance and long service life that require no lubrication. The recommended discharge pressure limits for this pump are 100 PSI for water and non-lubricants, 150 PSI for oil and other lubricants, as the high pressure will accelerate wear. For the longest service life keep the pressure as low as possible. The maximum shaft speed is 1750 RPM. Viscous liquids require lower pump speeds and the maximum Viscosity limit is up to 50,000 SSU. The motor on this pump is DC Permanent Magnet Rigid Base Motor.
WEIGHT : The Oberdorfer N993R-C81 weighs 32 Lbs.
There are many applications that the Oberdorfer N993RC81 are used in. 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. This compact DC portable unit is convenient for on site servicing of vehicles, machinery and field equipment. For pumping oil direct from crankcase or oil reservoir, drums, containers, transfer diesel fuel to vehicles, pumping other liquids and chemicals compatible with materials of construction. Pumping viscous oils, SAE 30 or greater, can overload motor. Intermittent use is recommended when pumping viscous oils, especially in cold weather. Service life will be increased substantially if liquid pumped is clean and has lubricity value. These pumps have extremely close tolerances. Fine abrasives like sand, silt or powders in suspension will destroy pumping ability. Liquids compatible with bronze, stainless steel and the BunaN lip seal can be pumped. For solvents a Viton lip seal is available. For a Viton Seal, add S5 to the pump model number. 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. These gear pumps are used in Waste Water Effluent Sampling to draw samples from canals and waste areas to test the cleanliness of the water. They are used in Day Tank Diesel Transfer Systems, and have been one of the leading Diesel fuel transfer pumps for over 100 years. The purity of the fuel is an important feature in prolonged engine life and high performance. Fuels must provide satisfactory combustion without creating additional pollutants that can damage the engine. Oberdorfer 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. These features make Oberdorfer pumps your best choice to keep your engines running longer and more efficiently. This pump is also the best solution for General Water Service, Chilled and Hot Water Systems, HVAC Industrial Processes, Municipal Drinking Water, Sprinkler and Irrigation Systems. NOTE Thick or viscous liquids are not recommended for centrifugal pumps. Because centrifugal pumps are more efficient at higher shaft speeds, pumping of viscous or thick liquids is difficult. It is possible to lose as much as 40 percent pump performance when attempting to pump liquids of viscosity equal to S.A.E. 30 oil at room temperature. S.A.E. 30 oil at room temperature has a viscosity of 2000 Saybolt Seconds Universal.