Aspects of this topic are discussed in the following places at Britannica.
The most common type of gear pump is illustrated in Figure 1. One of the gears is driven and the other runs free. A partial vacuum, created by the unmeshing of the rotating gears, draws fluid into the pump. This fluid is then transferred to the other side of the pump between the rotating gear teeth and the fixed casing. As the rotating gears mesh together, they generate an increase in pressure...
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