A hydraulic valve is a device used in hydraulic systems to control the flow of liquids. They can be found in various industrial and agricultural applications as well as in trucks and construction machinery. There are several types of hydraulic valves that perform different functions, including:

• Diverter valves - direct the flow of liquid to different parts of the system.
• Flow control valves - regulate the speed of liquid flow.
• Pressure valves - maintain or limit the pressure in the system.
• Check valves - allow liquid to flow in one direction, preventing backflow.

Each of these valves is critical to the proper operation of the hydraulic system, ensuring control, safety and operational efficiency.