The D636 valves (flow control valves) and the D638 valves (pressure control valves) are Direct Drive Valves (DDV). The valves are throttle valves for 2-, 3-, 4-, 2x2-way applications and are suitable for electro-hydraulic control of position, speed, pressure, and power even under high dynamic requirements. A permanent magnet linear force motor is used to drive the spool. In contrast to proportional magnet drives, the linear force motor adjusts the spool in both working directions from the spring-loaded middle position.

This gives the servo-proportional valve strong actuating power for the spool, as well as good static and dynamic characteristics.

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