Moog G771 Series Electro Hydraulic Flow Control Servo Valve

MOOG G771K200A hydraulic servo valve
MOOG G771K201A Servo Valve

Description:

The Moog G771 Series Servo Valve is a high-performance, electrohydraulic flow control valve designed for precision motion control in industrial and aerospace applications. With fast response, excellent hysteresis characteristics, and robust reliability, the G771 is widely used in plastic machinery, metal forming, test benches, and hydraulic servo systems requiring stable, repeatable control.

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Key Feature of Moog G771 Series Electro Hydraulic Flow Control Servo Valve

  • Hydraulic Performance: Rated flow at 70 bar (ΔP) ranges from ±1 to ±38 L/min depending on model. Maximum rated pressure up to 315 bar (4560 psi). Internal leakage typically below 1.0 L/min at 70 bar. Frequency response up to 120 Hz (−90° phase). Threshold less than 0.4% of rated current. Hysteresis typically below 1%. High spool resolution and fast dynamic response ensure excellent control accuracy. Recommended filtration ≤10 μm absolute (3 μm preferred).

 

  • Electrical Characteristics: Linear force motor coil. Rated input current options ±10 mA, ±20 mA, ±40 mA depending on configuration. Coil resistance typically 40–200 Ω. Current-drive input signal. Connector styles include MIL-C-5015 4-pin, DIN connectors, or Moog industrial connectors. Electrical null adjustable depending on version.

 

  • Mechanical Data: Two-stage electro-hydraulic design with steel body and hardened spool. ISO or ANSI standard subplate mounting interface. Approximate weight 1.0–1.5 kg depending on configuration. Fluid compatibility with standard hydraulic oils. Designed for high reliability in continuous servo duty environments.

 

  • Environmental: Operating temperature −20°C to +70°C. Storage temperature −40°C to +80°C. High vibration resistance per Moog industrial servo standards. Compatible with harsh industrial conditions.

 

  • Applications: Hydraulic test benches, aerospace actuation systems, servo-hydraulic presses, injection molding machines, motion simulation platforms, precision industrial automation, and closed-loop positioning systems requiring high dynamic accuracy.

 

  • Ordering Information: The G771 series can be configured by flow rating, spool type, electrical interface, connector, null adjustment option, and feedback configuration. Exact performance depends on specific model code (e.g., G771-4005, G771-3004, etc.).

 

  • Installation Notes: Use clean filtered hydraulic oil per ISO 4406 recommendation. Maintain correct electrical polarity. Mounting orientation ideally horizontal for thermal stability. System should be properly bled to eliminate air. Ensure stable hydraulic supply pressure and avoid contamination or excessive vibration.