Model 50P-15 Close-Coupled Centrifugal Pump
Bronze Construction with Pedestal Mount
This pump with 5/8" diameter shaft projection is suitable for either direct drive with flexible coupling or pulley drive. Oberdorfer centrifugal pumps have a single rotating metal impeller and mechanical shaft seal with Buna rubber components standard. Liquid enters at the center and is thrown outward radially by centrifugal force. The impeller is not in contact with other pump parts resulting in quiet, efficient pumping action. The flow produced is not positive, which permits the discharge line to be shut off completely without danger of overloading motors or bursting lines. Consequently, a relief valve is not required. The liquid flow is proportional to the pump speed, and the higher the speed the greater the flow. Horsepower required varies directly as flow and pressure. Maximum horsepower is required with a wide open discharge line - point of maximum flow. With a throttled discharge, the flow decreases at a greater rate than the pressure increases thereby requiring less horsepower at the higher pressures. This is known as an "unloading" feature of the pump.
The Oberdorfer 50P centrifugal pumps have an external ball bearing isolated from the liquid being pumped. Their high-quality ball bearings are permanently filled with grease and sealed for maintenance-free operation. The main shaft seal is a mechanical, face-type seal of proven reliability. Also, due to generous internal clearances, these pumps can handle impurities in the liquid being pumped.
Long, trouble-free service life has made centrifugal pumps acceptable for industrial uses or wherever clean or contaminated liquid compatible with bronze is to be transferred or handled. Key applications for these pumps include generator cooling, air-conditioning and bilge pumping. These pumps are specifically designed for the (Onan) recirculating generator.
These centrifugal pumps are not self priming. Normally these pumps must be installed below the liquid level so that the liquid flows to the pump by gravity. However, if a foot valve is used at the beginning of the suction line and all air is bled from the suction line and pump by careful manual priming, these pumps will lift liquid on the suction side up to 15 feet. Such a system is only as positive as the ability of the foot valve to seal and keep the suction line and pump full of liquid. If the foot valve should leak, the pump will not prime.
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