The Woodward HRT R-DDV®(Rotary Direct Drive Valve)Servovalve is a proven, unique and rugged servovalve design. The limited angle, rotary torque motor drives a valve spool directly through an “eccentric” built into the motor shaft. Rotary operation of the motor results in linear spool motion which modulates fluid flow through the control ports of the valve.
The R-DDV® Servovalve utilizes an integrated electronic controller that is packaged into the torque motor housing. The controller compares spool position, which is monitored by an electronic device within the motor, with the input command signal. The resulting difference generates a current signal that drives the motor to the commanded position. The signal is electronically enhanced to ensure optimum valve performance and linearity.
Performance
• Fast valve response independent of pressure
(electric drive)
• Low internal leakage
• Operating pressures from vacuum to 5000 psi Reliability
• Exceptional reliability (no nozzles, jets or filters to plug)
• Stainless steel body
• Vibration rated 40 g’s
• Shock rated 60 g’s
• Low parts count Flexibility
• Compact size
• Hydraulic or pneumatic operation
- 0.10 – 60 gpm hydraulic flow
- 0.22 – 136 scfm pneumatic flow
• Easily interchangeable
• Variety of input commands (mA and Volts)
• ATEX certified for hazardous environments for model 27G Ease of Use
• Four pin electrical connector or pigtails
• Electronic control cards available
• Standard Fluid Power Interfaces
