In which category is a gear-type pump classified?

A gear-type pump is classified as a constant displacement pump because it delivers a fixed volume of fluid for each cycle of its operation. This type of pump operates by trapping a specific amount of fluid between the gear teeth and the pump casing as the gears rotate, creating a consistent flow rate. The volume moved per cycle does not change with varying back pressure, making the gear pump efficient for applications requiring a steady and predictable output.

In contrast, variable displacement pumps can change the volume they move depending on system demands, while constant pressure pumps maintain a consistent pressure output rather than a fixed flow volume. Dynamic displacement pumps rely on fluid velocity and pressure to create flow, differing significantly from the mechanism of gear-type pumps. Thus, the characteristics of the gear-type pump align perfectly with the definition of constant displacement, confirming its classification in this category.