Hydraulic resistance control for an actuator with two type A hydraulic half bridges. For example, the control of a hydraulic cylinder with a dual effect with a continuously adjustable directional valve with 4 control edges, which all have a negative overlap (Figure V 25).
The valve control with four edges is particularly important when copying, where it enables maximum force amplification. However, it requires a high level of accuracy in production due to four control edges to be coordinated.
Figure V 25: Valve control with four edges