Original German MOOG Servo Valve with 7 bar Pilot Pressure 16 kg Weight and 0.1 kW Power for Electro-Hydraulic Control

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 for stable long-term operation
• Variety of Designs: Available in various series to meet different performance needs
• Fail-Safe Functionality: Some models include a fail-safe feature

• 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
• Coil Resistance: Typically in the range of 72-88 Ω
• Operating Temperature: -20°C to 80°C

• Industrial Machinery: Metal forming equipment, wood presses, plastic machinery
• Power Generation: Control of steam turbine valves, gas turbine fuel systems
• Test and Simulation: Automotive and aerospace test rigs, flight simulators
• Other Fields: Robotics, material handling

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

• Cylinder Refusal to Move: Often due to a stuck servo valve
• Uncontrolled Valve Movement: Sudden full opening/closing
• Cylinder Oscillation ("Cylinder Hunting")
• High Cylinder Lag