Name one common type of hydraulic pump.

A gear pump is a common type of hydraulic pump widely used in various fluid power applications. It operates on the principle of positive displacement, meaning that it moves a specific volume of fluid with each rotation. This is achieved through two gears (or a gear and a housing) that create chambers, drawing fluid into the pump and then forcing it out under pressure as they rotate. Gear pumps are known for their efficiency and ability to handle high pressures, making them suitable for hydraulic systems like those found in excavators, forklifts, and other machinery that requires reliable hydraulic power.

Other types of pumps mentioned, such as rotary pumps, diaphragm pumps, and centrifugal pumps, serve different purposes in fluid handling and may not be primarily used for hydraulic applications. For instance, diaphragm pumps are often used for applications requiring a change in flow rate, while centrifugal pumps are typically used to move liquids with low viscosity. Each type of pump has its specific design and operational characteristics suited for particular tasks, but gear pumps are particularly prevalent in hydraulic systems due to their robust design and effectiveness in handling the demands of hydraulic fluid movement.