The HR Textron R-DDV® servovalve is a unique, high performance and rugged servovalve. A revolutionary design approach incorporates an electronically controlled, permanent magnet brushless dc motor to drive a single stage spool valve. This innovation results in superior reliability and outstanding servo performance at a price comparable to traditional servovalve designs. The R-DDV® servovalve has been proven in thousands of hydraulic and pneumatic applications.

In simplest terms, a limited angle brushless dc torque motor drives a valve spool directly through an "eccentric" built into the motor shaft. Rotary motion of the motor shaft results in motion of the spool, which in turn modulates fluid flow through the valve control ports.

R-DDV® servovalve incorporates an integrated electronic controller with sophisticated control algorithm, which is packaged into the motor enclosure. The controller compares the electronically monitored spool position with the input command signal. The resulting error signal is amplified to produce a current, which drives the motor to the commanded position. The signal is electronically enhanced to give optimum valve performance Ð hysteresis, linearity and internal leakage are minimized while dynamic performance and stability are optimized.

Four hydraulic models are available. Review the specification information at this web site, then contact your local distributor or "Industrial Motion Control" at 888-659-4229 to review your specific application.