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Internal Gear Pumps

The Workhorse of Countless Manufacturing Processes

The internal gear pumping principle was invented by Jens Nielsen, one of the founders of Viking Pump. It uses two rotating gears which un-mesh at the suction side of the pump to create a vacuum which pulls fluid into the pump. The spaces between the gear teeth transport the fluid on either side of a crescent to the discharge side, and then the gears re-mesh to discharge the fluid.

Features & Benefits

  • Reliable and Easy to Maintain

    Only two moving parts.

  • Adjustable End Clearance

    For low or high viscosities, high temperatures, or to compensate for wear over time.

  • Shaft Seal Options

    Including packed gland, lip seal, component seal, cartridge seal and sealless mag drive options.

  • Porting Options

    Viking's broadest selection of port locations, configurations, and types.

  • Minimal Pulsation

    For accurate flow measurement.

  • One Shaft Seal

    More reliable and lower cost than two used on timed lobe and screw pumps.

  • Compact, Close-Coupled Options

    For motor speed operation or with gearmotors.


Max. Capacity: 
to 1,600 GPM (365 M³/Hr)
Max. Pressure: 
to 250 PSI (17 BAR)
Viscosity Range: 
28 to 2,000,000 SSU (1 to 440,000 cSt)
Temperature Range: 
-120°F to +800°F (-85°C to +430°C)