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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 voids which allow
atmospheric pressure to force 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.
Viking's internal gear design has an outer drive gear (rotor- shown in
orange) which turns the inner, driven gear (idler-shown in white).
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