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Gear Pumps

Fluid gets trapped between the teeth/vanes of the rotational elements inside the casing & then flows through the pump at a flow rate proportional to the rotational speed of these rotating elements. Rotational elements include gears, lobes, or vaned impellers, depending on the type of gear pump.

  • Consists of two identical gears, interlocked & placed above one another inside the casing. These two gears are supported by two separate shafts with one of the shafts connected to the drive, thus referring to the "Drive Gear" and "Driven Gear".
  • Consists of a small gear (idler) inside a larger gear (rotor), interlocked and separated by a crescent. The rotor is connected with a shaft to the drive and thus the idler gets driven by the rotation of the rotor.
  • Consists of two pumping elements (rotors) rotating in opposite directions inside the pump casing. A cavity is created on the suction side. Fluid fills this cavity and the rotation of the rotors displaces the fluid through the pump to the discharge.
  • Consists of a vane impeller connected to the drive of the pump. On the inlet side, the rotation of the impeller increases the volume of the vane chambers. The vane chambers then get filled with fluid and the vane chambers get emptied at the discharge, thus pumping the fluid out.


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