Hydraulic valves from Bosch Rexroth control and regulate the volume flow, where the start, stop, direction and volume of the flow can be influenced for one direction of motion or rotation of hydraulic drives. The valves are actuated via various operating methods and in this way, can cause the valve elements to open or close. Here, it is possible to have fixed switching positions for on/off valves or adjustable interim positions for proportional servo valves.