Which device controls the flow of hydraulic fluid in a system?

The device that controls the flow of hydraulic fluid in a system is a valve. Valves play a crucial role in hydraulic systems by regulating the direction, pressure, and flow of the hydraulic fluid. There are various types of valves used in hydraulic applications, including directional control valves, pressure relief valves, and flow control valves. Each type serves a specific function, allowing operators to manage the performance and efficiency of the hydraulic system effectively.

Conversely, bearings are primarily used to support rotating components and reduce friction, filters are utilized to remove contaminants from the hydraulic fluid, and actuators convert hydraulic energy into mechanical motion. While these components are essential in a hydraulic system, they do not specifically control the flow of hydraulic fluid, which is the primary function of a valve.