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Model 27A

R-DDV

Servovalve, Hydraulic Family

Woodward R-DDV® Servovalve is designed for high precision, closed-loop motion control hydraulic systems. Applications include load, position, velocity, acceleration and force control.
Product Type
  • Application Notes
  • Brochure
  • Product Specification
  • Software Manual
  • Technical Manual
  • Software
FEATURES & FUNCTIONALITY
The R-DDV® Servovalve is a new, 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 direct, linear spool motion which modulates the flow of fluid through the control ports of the valve.
 
The R-DDV® Servovalve is designed for high precision, closed-loop motion control hydraulic systems. Applications include load, position, velocity, acceleration and force control in the following industries:
- Die casting
- Lumber processing
- Test and simulation
- Metal processing
- Oil and gas
- Robotics 
 
Outstanding Response:
The R-DDV® Servovalve offers exceptional response with a -3dB frequency response of 200 Hz for the Model 27A and 90Hz for the Model 27G. The four valve models provide 16 different hydraulic flow rates from 0.18 gpm to 60 gpm.
 
Superior Reliability:
The R-DDV® Servovalve steel spool and body is a robust, rugged design that is tolerant to high mechanical shock and pressure impulses that typically destroy torque tubes, jet-pipes, and internal filters.
 
Woodward’s patented R-DDV® Servovalve rotary direct-drive design controls flow through the valve in a single stage that is independent of supply pressure for outstanding performance and reliability. The R-DDV® Servovalve eliminates the sensitive first-stage fluid amplifier where most shock and contamination problems occur in conventional 2-stage servovalves. There are no springs, nozzles, jets, filters, or pilot valves to maintain or replace.