MOOG G771K202 Servo Valve

The MOOG G771K202 servo valve is a high-performance electro-hydraulic servo valve produced by the MOOG company. It features high precision control, high-frequency response, high reliability, and wide application adaptability. Here is a detailed introduction:
I. Product Characteristics
High Precision Control: Adjust the flow and pressure of the hydraulic system through electrical signals (current/voltage) to control the position, speed or force of the actuator (cylinder, motor). The repeatability positioning accuracy reaches ±0.05%.
High Frequency Response: Dynamic response frequency can reach 200-500 Hz (for some models), supporting millisecond-level closed-loop control, meeting the requirements of high-speed motion.
High Reliability:
Jet tube design can withstand NAS 9 level oil contamination, reducing maintenance frequency.
MTBF (Mean Time Between Failures) exceeds 50,000 hours.
Operating Temperature Range: -54°C to +135°C (military standard models), suitable for extreme conditions.
Impact and Vibration Resistance: 20g @ 2000Hz, meeting aerospace and military requirements.
High Compatibility: Supports ±10 mA, ±100 mA current input or 0-10 V voltage signal, compatible with PLC, motion controller outputs.
Special Models Available: Provide explosion-proof, high-temperature resistant, ultra-low leakage and other special models, suitable for complex scenarios such as power plants and chemical plants.
Comprehensive Certifications: Certified by AS9100D (aviation), ATEX (explosion-proof), SIL3 (functional safety), leading in reliability industry.
II. Internal Structure and Working Principle
Permanent Magnet Torque Motor: Converts the input electrical signal into mechanical motion to drive the nozzle baffle system.
Dual Nozzle Baffle Pilot Stage: Adjusts the gap between the baffle and the nozzle to generate pressure difference and drive the slide valve to move.
Slide Valve and Valve Sleeve: The main valve core moves under the pressure difference of the hydraulic oil to control the on-off and flow of the hydraulic oil.
Mechanical Feedback System: Real-time feedback of the valve core position through the cantilever spring rod to ensure control stability.
Control Chamber: Balances the hydraulic pressure on the valve core to ensure the valve core can move stably.

Application fields
The MOOG G771K202 servo valve is widely used in industries and aerospace fields that require precise control of fluid power, including but not limited to:
Gas turbine: Used to control the fuel supply of the gas turbine to achieve precise speed and power control.
Blow molding equipment: During the blow molding process, it is used to control the wall thickness of the mold base to ensure product quality.
Aerospace: Used in critical systems such as flight control, landing gear retraction and extension, and engine fuel regulation.
Metallurgy and chemical industry: Plays an important role in equipment such as rolling mills, testing machines, turbine guide vanes regulation, and wind power pitch systems.