Northern 4900 Series

The 4900 Series gear pump is a positive displacement, rotary pump with two gears of equal size. The pump has a constant discharge at constant rotational speed. The inlet port of the pump is on the side where the gears are coming out of mesh. The discharge port is on the side of the pump where the gears are coming in to mesh. The pump transfers fluid trapped in the spaces between adjacent gear teeth and the cylinder from the inlet to the discharge side of the pump.There are virtually unlimited variations of the pump assembly possible depending on the application. The combination of the width of the gear and the speed of the pump determine the flow rate. Generally, with narrower gears, the inlet and discharge ports are NPT connections and located on the seal adapter plate. With wider gears, the inlet and discharge ports are cast flanges and located on the cylinder. Welded flanges on the Seal Adapter Plate or Cylinder may also be used should the application require them. The shaft is typically sealed with a John Crane Type 21, mechanical seal; however, the pump assembly may use Type 8-1, Type 9 or a Type 8B1 seal.

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Northern 4900 Series