Hydraulic valves are essential components of hydraulic systems that control the flow and pressure of fluid within the system. These valves are typically made up of a valve body, spool, and actuator, which work together to control the flow of hydraulic fluid. There are many types of hydraulic valves, including directional control valves, pressure control valves, flow control valves, and check valves. Each type of valve serves a specific purpose within the hydraulic system, and proper selection and maintenance of these valves are crucial to the efficient and safe operation of hydraulic machinery.