G771K202A

1. Product Overview
MOOG G771K202A is a high-performance electro-hydraulic servo valve designed and manufactured by MOOG Corporation in the United States, specifically developed for high-precision, high dynamic response industrial automation and control systems. Its core function is to convert electrical signals into precise hydraulic flow and pressure control, widely used in fields such as gas turbines, blow molding equipment, aerospace, metallurgy, and chemical industry.

2. Structure and working principle

Core components:
Torque motor: As an electromechanical converter, it converts input electrical signals into mechanical motion to drive the nozzle baffle system.
Dual nozzle baffle pilot stage: By adjusting the gap between the baffle and the nozzle, a pressure difference is generated to drive the slide valve movement.
Slide valve output stage: controls the flow rate of the main oil circuit to achieve high-precision regulation.
Mechanical feedback system: Real time feedback of valve core position through cantilever spring rod to ensure control stability.

Workflow:
Input electrical signal → torque motor drives baffle → nozzle pressure difference change → slide valve displacement → flow/pressure output → mechanical feedback closed-loop regulation.

3. Technical parameters
Rated flow rate: 63 L/min (at a pressure drop of 7 MPa).
Working pressure: The maximum allowable pressure is 32 MPa, and the recommended working pressure is 14 MPa.
Resolution:<0.5%, hysteresis<3%, ensuring high-precision control.
Working temperature: -29 ℃ to+135 ℃, suitable for harsh industrial environments.
Sealing material: Fluororubber (FKM), high temperature resistance, corrosion resistance, and extended service life.

4. Application scenarios
Gas turbine control: Adjust hydraulic system parameters (such as fuel flow rate and valve opening) to ensure efficient and stable operation.
Industrial automation: integrated into closed-loop control systems for high-precision adjustment of position, speed, and force.
Blow molding equipment: In conjunction with the DIGIPACK wall thickness control system, it achieves dynamic control of the billet wall thickness.
Aerospace and Ship: High response scenarios such as servo vibration generators and servo control.

5. Product advantages

High frequency response: Adopting a dual nozzle baffle structure, the bandwidth can reach several hundred hertz, adapting to fast dynamic requirements.
High reliability: Industrial grade design, vibration and high temperature resistance, protection level IP20, suitable for harsh environments.
Low energy consumption: Integrated electronic control reduces hydraulic system energy consumption, saving 70% energy compared to traditional systems.
Strong compatibility: Supports multiple control signals (analog electrical signals, digital commands), compatible with industrial protocols such as Modbus.