Direct Drive Servo Valves

The valves directly drive a spool with a small and high-power linear motor. Direct drive servo valves electrically send the spool position data to the controller to provide quick response and high contamination resistance. These valves are available in two types: direct spool control and pilot operation (a combination of small valves).

Figure 9.7 shows illustrations of direct drive servo valves. Table 9.2 and Figures 9.8 and 9.9 give the specifications, flow rate characteristics, and frequency response of typical direct drive servo valves.

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