Gear pump 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.  Our gear design has an outer drive gear (rotor- shown in orange) which turns the inner, driven gear.

 
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