The Function of a Gear Pump


A pump refers to a device designed to move fluids. A gear pump pumps fluid by gear revolution through a displacement process.

Positive Displacement

  • Gear pumps operate through positive displacement, a process that moves fluid by displacing, or forcing, a trapped volume of the fluid through a specific channel. This process enables the gear pump to pump fluid at a constant rate per gear revolution.


  • Gears transmit fluid to the discharge end of the gear pump. The gears then mesh, or interlock, displacing the fluid. When the gears move or rotate, they move apart at the pump’s intake end. This gear separation creates suction, which draws in more fluid. The rigidity of the gears enable highly viscous fluids to be pumped. The speed of the gear rotation prevents fluid from leaking or moving in the opposite direction.


  • Gear pumps are frequently used in chemical installations where the fluid pumped must contain a specific viscosity. Gear pumps are also used to power hydraulic machinery, or tools or machines that operate via high pressure fluid.

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  • Photo Credit pump image by Aleksander Nordaas from
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