A MOOG Electro-Hydraulic Servo Valve is an electro-hydraulic conversion and power amplification component. Its primary function is to receive analog electrical control signals and then proportionally adjust the output flow and pressure of hydraulic fluid based on these signals, thereby achieving precise control of hydraulic actuators.

• High-Precision Control: They offer exceptional control accuracy, which can reach about 0.1%
• High Dynamic Performance: They feature fast response times, often in the millisecond range
• High Reliability and Stability: Designed with advanced technology and materials
• Variety of Designs: Available in various series to meet different performance needs
• Fail-Safe Functionality: Some models include a fail-safe feature

MOOG offers a comprehensive range of servo valves including:

• G761 Series: Two-stage flow control valve with mechanical feedback
• D630 Series: Feature direct drive by a linear force motor
• D660, D661, D662 Series: Classic two-stage servo valves
• 72 Series: Standard response two-stage valves

• Maximum Operating Pressure: Up to 4000-4500 psi (approx. 31.5 MPa)
• Flow Control Range: From a few liters/minute to very high flows
• Input Signal: Typically a current signal (e.g., ±40 mA) or a voltage signal
• Operating Temperature: -20°C to 80°C

• Industrial Machinery: Metal forming equipment, injection molding machines
• Power Generation: Control of steam turbine valves, gas turbine fuel systems
• Test and Simulation: Automotive and aerospace test rigs
• Other Fields: Robotics, material handling

Common failures can be categorized by the valve's internal components:

• Torque Motor Issues: Broken coils, contamination in air gap
• Nozzle/Flapper Stage Issues: Clogged nozzles or orifices
• Spool Amplifier Stage Issues: Spool sticking, cutting edge wear

• Oil Filtration: Use high-quality filters and adhere to a strict oil analysis schedule
• System Design: The hydraulic system should be designed to minimize dead spots
• Regular Inspection: Periodically check the valve and system for leaks
• Preventive Maintenance: Follow the manufacturer's recommended maintenance intervals

Yes, MOOG can provide custom solutions and modify product components to enhance performance or meet specific application requirements.

A detailed test report is typically provided verifying that the valve's performance meets specifications. Key parameters tested include flow characteristics, null bias and hysteresis, internal leakage, and frequency response.

You can contact MOOG or their authorized distributors and partners worldwide for technical support, sales, and service.