Moog Servo Proportional Valves
MOOG Servo Valves D791 and D792 Series
  • Description
  • Technique Feature
  • Specification
  • Applied Range

Moog Valves D791 and D792 Catalog


D791 and D792 Series Three stage servovalves

The flow control servo proportional valves D791 and D792 Series are throttle valves for 3-way and preferably 4-way applications. These three stage servovalves have been especially developed for such demanding applications where high flow rates and at the same time extreme dynamic performance requirements must be met. The design of these valves is based on the well known D079 Series. The integrated electronics has been replaced by a new design applying SMD technology. The valves are offered with pilot valves of D761 or D765 Series, optional standard
response or high response versions are available. Series D791 can deliver rated flow up to 250 l/min, Series D792 is available with rated flow up to 1000 l/min.
These valves are suitable for pressure or force control, position and velocity control systems with high dynamic response requirements.

An electrical command signal (set point, input signal) is applied to the integrated control amplifier which drives a current through the pilot valve coils. The pilot valve produces differential pressure in its control ports. This pressure difference results in a pilot flow which causes main spool displacement.
The position transducer which is excited via an oscillator measures the position of the main spool (actual value, position voltage). This signal then is demodulated and fed back to the control amplifier where it is compared with the command signal. The control amplifier drives the pilot valve until the error between command signal and feedback signal is zero. Thus, the position of the main spool is proportional to the electrical command signal.


Operational features
- Electrical position feedback with pressure isolated position transducer (LVDT), no wear.
- Integrated SMD electronics with false polarity protection.
- Optional external pilot supply and return connections via fifth and sixth port in valve body.
- Low threshold and hysteresis, excellent null stability.
- Preadjusted at factory.

D791 and D792 Series Three stage servovalves


D791 Series Technical data



D792 Series Technical data

Pilot-Operated Servovalves for Analog Signals D791 and D792 Series

- 3-stage valve design for high dynamics

- Electrical position feedback (LVDT) - No wear

- Integrated electronics with inverse polarity protection

- Optional external pilot supply and return connections via additional x and y port in valve body

- Low threshold and hysteresis, excellent stability at null



Hydraulic Data

Rated Flow 100 to 1,000 l/min (26.4 to 264 gpm) @ ∆p 35 bar (500 psi) per land

Maximum Flow 1,100 l/min (290 gpm) (D792)

Maximum Operating Pressure 350 bar (5,000 psi)

Mounting Pattern Moog Standard

100% Step Response 3 to 12 ms @ 210 bar (3,000 psi)


Electrical Data

Supply Voltage +/- 15 VDC, 24 VDC (18 to 32 VDC)

Rated Signal Options +/-10 V, +/-10 mA and 4-20 mA

Options N/A


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