The D636 and D637 Series Valves, sizes 03 and 05 are direct drive servo valves with flow control. The valves are throttle control valves for 4- (2-, 3-, 2x2-) way applications and are suitable for electrohydraulic control of position, speed, pressure and force even under high dynamic requirements.

A permanent magnet linear force motor is used to drive the spool. In contrast to proportional solenoid drives, the linear force motor drives the spool in both working directions from the spring-centered middle position. The strong actuating force of the spool, provides Moog servo valves with excellent static and dynamic characteristics.

The digital driver and control electronics are integrated in the valve. The valve electronics contain a microprocessor system which executes all the important functions via the valve software it contains. The digital electronics enables the valve to be controlled across the full range of operation, with significantly reduced influence from temperature and drift.

A built-in fieldbus interface (e.g. CANopen®, Profibus-DP® or EtherCAT®) enables operating parameters to be set, activates the valve and monitors its performance. To reduce wiring, the fieldbus interface is provided with two connectors. Thus, valves may be integrated into the bus without any external T-joints. In addition, up to two analog input commands and up to two analog actual value outputs are available. Optionally, the valves are available without a fieldbus interface. In this case, the valve is controlled using analog inputs. Valve parameters are set using the integrated M8 service connector.

In addition, axis control functionality such as position control, velocity control, and force control can be added to the valves. The control mode can be switched over from one to the other by defined events. Our application engineers can assist you with any additional information you may require.