Hydraulic valves are just like any other mechanical valves, except it works to regulate and redirect fluid within a hydraulic circuit. Hydraulic valves are used best in situations where pressure of flow of the fluid needs to be regulated or the fluid needs to be redirected to a different direction. The only reason why hydraulic valves get preferred over regular valves is due to the fact that it can withstand immense pressure. They are made out of materials like iron or steel that have the capability to withstand the fluid pressure. In general there are three types of hydraulic valves based on their specific function. They are as follows:
Hydraulic pressure control valves
Hydraulic flow control valves
Hydraulic directional control valves