Figure shows the operating
principle of an external gear pump. It consists of a driving gear and a driven
gear enclosed in a closely fitted housing. The gears rotate in opposite
directions and mesh at a point in the housing between the inlet and outlet
ports. Both sets of teeth project outward from the center of the gears. As the
teeth of the two gears separate, a partial vacuum forms and draws liquid
through an inlet port into chamber A. Liquid in chamber A is trapped between
the teeth of the two gears and the housing so that it is carried through two
separate paths around to chamber B. As the teeth again mesh, they produce a
force that drives a liquid through an outlet port.
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