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Phone：+86 17062388866Description
The MOOG G771K200A is a high-performance, two-stage electro-hydraulic servo valve engineered for applications demanding exceptional dynamic response, precision flow control, and fail-safe reliability. As a member of Moog’s proven G770 series, the G771K200A combines a high-gain torque motor pilot stage with a robust spool-type power stage to deliver accurate, repeatable hydraulic actuation under pressures up to 3000 psi (210 bar). With a rated flow of 3 gallons per minute (GPM) at 1000 psi pressure drop, it is ideal for mid-range force and motion control tasks in test rigs, simulators, and industrial automation systems.
A key safety feature of the MOOG G771K200A is its spring-centered spool design, which automatically returns the valve to neutral upon loss of electrical signal or power—preventing uncontrolled actuator movement. This makes it especially suitable for personnel-accessible environments like flight simulators or structural test cells where safety is paramount. The valve accepts a standard ±10 VDC analog input signal and features low hysteresis (<1>60 Hz, enabling tight closed-loop control in real-time systems. Built with hardened stainless steel internals and contamination-resistant geometry, the MOOG G771K200A delivers long-term stability even in demanding operational cycles.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | MOOG G771K200A |
| Manufacturer | Moog Inc. |
| Valve Type | Two-stage electro-hydraulic servo valve |
| Input Signal | ±10 VDC (differential or single-ended) |
| Max Operating Pressure | 3000 psi (210 bar) |
| Rated Flow (ΔP = 1000 psi) | 3 GPM (11.4 L/min) |
| Spool Configuration | 4-way, spring-centered (fail-safe to neutral) |
| Frequency Response | ≥60 Hz (–90° phase typical) |
| Hysteresis | <1> |
| Linearity | ±2% of rated flow |
| Fluid Compatibility | MIL-H-5606, MIL-PRF-83282, ISO VG 32/46 |
| Operating Temperature | –54°C to +121°C (–65°F to +250°F) |
| Mounting Standard | SAE AS5182 (ISO 4401-05-04-0-05) |
| Electrical Connector | MS3102A14S-6S (or equivalent) |
| Certifications | CE, RoHS compliant |
Main Features and Advantages
✅ Fail-safe spring centering: Automatically centers the spool on signal/power loss—critical for safety in human-in-the-loop systems.
✅ High dynamic performance: >60 Hz bandwidth enables accurate tracking of rapid command changes in real-time simulation.
✅ Low hysteresis & high repeatability: Ensures consistent test results and reduces need for frequent recalibration.
✅ Robust contamination tolerance: Precision-lapped spool with optimized clearances resists jamming from minor fluid particulates.
✅ Drop-in legacy compatibility: Replaces older G761-3001, G762-3002, and similar valves without manifold redesign.
✅ Global standard interfaces: SAE-compliant ports and MS-style connector simplify integration into existing hydraulic systems.
Application Field
The MOOG G771K200A excels in dynamic test and simulation environments where precision, speed, and safety converge:
Flight Simulators: Controls motion platforms for pitch, roll, and heave with smooth, jitter-free response.
Structural Fatigue Testing: Applies cyclic loads to aircraft components, bridges, or wind turbine blades with high fidelity.
Automotive Test Rigs: Drives suspension shakers, steering test stands, and brake dynamometers requiring fast force modulation.
Industrial Automation: Used in metal forming, plastic injection, and robotic hydraulics for closed-loop position/force control.
Seismic Simulation Tables: Replicates earthquake waveforms on scaled building models with millisecond accuracy.
Wind Tunnel Actuators: Adjusts model angles or flap positions in real time during aerodynamic testing.
Related Products
MOOG G771K201A: Variant with different null bias or flow gain; verify compatibility before substitution.
MOOG G772K240A: Higher-flow (5 GPM) version in the same series for larger actuators.
MOOG G761-3001: Legacy single-stage valve often replaced by G771K200A in upgrades.
MOOG D633/D634: Compact servo valves with integrated electronics (no external amplifier needed).
MOOG J-Series (e.g., J051): High-flow (>10 GPM) servo valves for large test frames.
Parker D1FP / Bosch Rexroth 4WRPEH: Competitive alternatives, though not mechanically or electrically identical.
Installation and Maintenance
? Installation Best Practices:
Flush hydraulic system to ISO 4406 16/13/10 cleanliness before installation.
Torque mounting bolts to 180–200 in-lb (per SAE AS5182).
Use shielded twisted-pair cable for ±10 V signal; ground shield at controller only.
Ensure return line pressure remains below 150 psi to avoid spool instability.
? Maintenance Recommendations:
Replace suction and pressure filters every 500 operating hours.
Monitor for symptoms: increased null current, flow drift, or oscillation—indicative of wear or contamination.
Perform annual functional validation using a servo valve tester (flow vs. current curve).
Do not disassemble in the field—return to authorized Moog service center for recalibration.
Keep a spare G771K200A on-site to minimize downtime in critical test operations.
