Gear pump

Gear Pump

Gear pumps are used extensively for pumping fuel oil, lubricating oil and hydraulic oil.

When gears are unmeshed on the inlet side, a drop in pressure occurs that helps the atmospheric pressure acting on the surface fo the oil in the reservoir to force it up the pipe to fill the void, the oil is then transferred around the periphery of the pump housing. As the gear teeth mesh again on the outlet side , they form a seal that prevents oil from backing up to the inlet , the oil in the void is then forced out into the discharge line.