MOOG G771K201 Two-Stage Electro-Hydraulic Servo Valve

MOOG G771K201 belongs to Moog G771 series two-stage electro-hydraulic servo valve with mechanical spool feedback. It converts analog electrical command signals into continuous adjustable hydraulic flow, serving as the core control component for closed-loop hydraulic motion control systems.

This servo valve adopts double nozzle-flapper pilot stage and dry torque motor design, featuring fast response, low hysteresis and high resolution. It supports mineral oil and phosphate ester fire-resistant fluid, widely used as spare parts for power, metallurgy and industrial test equipment maintenance projects.

Main Specifications

• Brand: MOOG
• Model: G771K201
• Product Type: Two-stage Flow Control Servo Valve
• Feedback Mode: Mechanical Spool Feedback
• Max Working Pressure: 210 bar
• Pilot Stage: Double Nozzle-Flapper, Dry Torque Motor
• Input Signal: Analog current signal
• Fluid Medium: Hydraulic oil, phosphate ester fluid
• Filtration Requirement: 10μm absolute filter or higher
• Operating Temperature Range: -40°C ~ +135°C

Core Functions

• Realize precise proportional regulation of hydraulic flow and direction according to electric control signals
• Support closed-loop control of position, speed and force for hydraulic actuators
• Excellent dynamic performance ensures stable operation under frequent load changes
• Low hysteresis and high resolution guarantee consistent repeated control accuracy
• Dry torque motor structure avoids corrosion risks caused by contact with hydraulic medium
• Adjustable null bias allows on-site calibration to optimize system control performance
• Loss of command signal enables zero flow failsafe protection to avoid equipment runaway
• Built-in pilot filter prevents particle contamination from blocking the nozzle-flapper assembly
• Standard mounting interface facilitates direct replacement during equipment overhaul
• Reduce failure risks of high-precision hydraulic closed-loop control systems

Application Scenarios

• Thermal power plant steam turbine DEH electro-hydraulic control EH oil system
• Metallurgical rolling mill AGC hydraulic thickness closed-loop control equipment
• Industrial material fatigue testing machine and hydraulic simulation test bench
• Petrochemical large turbocompressor auxiliary hydraulic servo control unit
• Auxiliary precision hydraulic control system of waste heat power generation units
• Heavy industry automation equipment high-response hydraulic actuator control loops
• Ship and offshore platform hydraulic precision motion control equipment
• Hydraulic system overhaul, renovation and servo valve spare parts replacement projects
• MOOG industrial servo valve spare parts stocking and after-sales maintenance projects