Description
MOOG G771K203A-H04FOFA4VJ4 Two-Stage Electro-Hydraulic Servo Valve
Basic Parameter Overview
- Full Model: G771K203A-H04FOFA4VJ4
- Brand: MOOG (USA, top-tier aerospace-grade servo valve manufacturer)
- Series: G771 compact two-stage dry torque motor servo valve family
- Structure: 2-stage double nozzle-flapper pilot control + sliding spool power stage, dry torque motor design
- Warranty: One Year
Core Hydraulic Specifications
- Rated Supply Pressure: 210 bar (3000 PSI) maximum working hydraulic pressure
- Flow Rate: Standard calibrated flow for G771K203 base model ≈17 L/min (4.4 GPM) at rated pressure drop
- Control Signal: Standard ±15mA analog differential current input (the suffix code H04FOFA4VJ4 defines coil impedance, feedback type, port configuration, explosion-proof certification, electrical connector pinout and null adjustment mode)
- Mounting Standard: ISO 10372-02-02-0-92 standard 4-hole flange installation base
- Fluid Compatibility: Suitable for mineral hydraulic oil, phosphate ester fire-resistant fluid, synthetic aviation hydraulic fluid
Electrical & Performance Index
- Hysteresis: ≤0.5% ultra-low hysteresis for closed-loop high-precision regulation
- Resolution: Infinite proportional micro-resolution, no step dead zone
- Frequency Response: High dynamic response bandwidth, stable under high-frequency load fluctuation
- Fail-Safe Logic: Automatically returns to neutral zero position when electrical control signal is lost, avoiding runaway actuator stroke
- Protection Grade: IP65 valve body housing; suffix code contains explosion-proof certification for Zone 1/2 hazardous gas environments
Environmental & Mechanical Data
- Operating Temperature: -20°C ~ +85°C
- Storage Temperature: -40°C ~ +120°C
- Vibration Resistance: Aerospace-grade anti-vibration and shock resistance, withstands long-term mechanical oscillation of turbines and reciprocating compressors
- Weight: Approximately 3.0 kg
- Cooling: Self-convection passive cooling, no fan required
Product Overview
The MOOG G771K203A-H04FOFA4VJ4 is a high-reliability closed-loop electro-hydraulic servo valve, widely matched with GE Mark VI / Mark VIe, Woodward 505/5000 turbine governor control systems as the core actuator for steam/gas turbine fuel valve, compressor anti-surge control, inlet guide vane (IGV) and throttle position closed-loop regulation.
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