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Hydraulic / Pneumatic Rotary Direct drive Servo Valves
Industrial product line introduced in 1994
R-DDV® technology evolved from aerospace program (A-12)
Single-stage, direct-drive with integrated electronics
Limited Angle DC Motor Driver
Rotary to Linear Design
Four models offering:
Flows up to 60 gpm
5000 psi capability
Up to 220 Hz bandwidth
Small size (low flows)
Low internal leakage
Contamination resistance
Compatibility with many fluids
EFB integrated pneumatic actuators:
1.0†& 2.0†bores, short strokes
Single-axis analog PID electronic controller
No small clearances so no internal filter
Continued operation with contaminated fluid
No hydraulic first stage
Lower internal leakage
No mechanical feedback wire
Valve insensitive to load-induced pressure spikes
Rotary motor
Valve tolerant of shock and vibration
Spool position controlled by electric motor
Valve operation is independent of supply pressure
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