Description
MOOG G771K289A is an ISO Size 02 intrinsically safe two-stage mechanical feedback electro-hydraulic servo valve from MOOG G771K hazardous location series, engineered for ultra-precise closed-loop flow, pressure and position hydraulic control in explosive industrial zones. This MOOG G771K289A features dry polarized torque motor and double-nozzle flapper pilot stage, accepts standard analog current control signals to drive hydraulic cylinders and actuators with minimal hysteresis and high resolution. As an ATEX/IECEx certified core hydraulic control spare part for power generation and petrochemical plants, G771K289A delivers fast dynamic response and excellent zero drift stability, widely deployed in gas turbine steam valve actuators, metallurgical rolling mill AGC systems, hazardous area hydraulic test benches and precision plastic molding equipment.
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Basic Procurement Parameters
- Brand: MOOG
- Model: G771K289A
- Availability: Original factory sealed new stock, fully calibrated & bench-tested refurbished valves in stock
- Delivery Time: 1–5 working days for in-stock items; 10–12 weeks for factory backorder
- Guarantee: 12-month full warranty counting from shipment date
- Condition: Brand new unopened OEM / Fully disassembled, cleaned, zero-adjusted and performance tested refurbished
- Series: G771K Intrinsically Safe Servo Valve
- Mounting Standard: ISO 10372 Size 02 mounting pattern
- Rated Flow: 19 L/min (5 gpm) at 70 bar pressure drop
- Max Operating Pressure: 210 bar (3000 psi)
- Rated Control Signal: 40mA single coil analog current
- 100% Step Response: 5–13 ms
- Frequency Response (-3dB): 120–200 Hz
- Safety Certification: ATEX Ex ia IIB/IIC T4, IECEx intrinsically safe certification
- Hydraulic Fluid: Mineral-based industrial hydraulic oil, Skydrol fire-resistant fluid compatible
- Recommended Fluid Viscosity: 10–97 cSt @ 38°C
- Fluid Cleanliness Requirement: ISO 4406 17/14/11 or cleaner
- Operating Temperature Range: -30°C ~ +135°C
- Seal Material: Fluorocarbon high-temperature resistant seals
- Net Weight: 0.86 kg
- Control Structure: Two-stage double nozzle-flapper with mechanical feedback (MFB)
- Extra Function: Field adjustable null bias; failsafe zero position on signal loss
Key Features & Advantages
- Intrinsically safe explosion-proof construction with complete ATEX/IECEx certification, certified for flammable gas, oil and chemical hazardous production areas
- Low-friction double-nozzle pilot stage + dry torque motor design, ultra-low hysteresis and high spool control force to guarantee micron-level motion positioning accuracy
- Compact ISO Size 02 standard mounting interface, direct interchangeable with G771K series equivalent models, zero manifold modification during on-site replacement
Industry Application Scenarios
- Power generation industry: Gas turbine hydraulic actuator precise positioning and load regulation control systems
- Metallurgical rolling mills: Steel strip AGC thickness adjustment, continuous casting vibration table hydraulic control
- Petrochemical hazardous workshops: Explosion-proof hydraulic test stands, remote process valve servo adjustment equipment
- Precision manufacturing: High-speed injection molding, die casting machine injection pressure & speed closed-loop control
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