The electro-hydraulic servo valves in aerospace are mainly used in the following areas:

1. Aircraft Hydraulic System: Electro-hydraulic servo valves are extensively utilized in aircraft hydraulic systems to regulate the movement of landing gears, wing flaps, rudders, elevators, and other flight control surfaces, as well as the hydraulic control of aircraft engines.

2. Spacecraft Attitude Control: Electro-hydraulic servo valves are used in spacecraft attitude control systems to adjust thruster attitude and achieve spacecraft orientation and attitude control.

3. Flight Simulator: The flight simulator uses electro-hydraulic servo valves to control its various movements, such as flight attitude, altitude, speed, and other parameters, to achieve the simulation of true flight. In conclusion, electro-hydraulic servo valves are extensively applied in the aerospace industry, specifically in the hydraulic systems of aircraft, spacecraft attitude control, and flight simulators, to enhance the control accuracy and safety of aircraft.

Generally speaking, electro-hydraulic servo valves are extensively used in the aerospace industry, specifically in the hydraulic systems of aircraft, spacecraft attitude control, and flight simulators. They play a critical role in improving control performance and ensuring the safety of aircraft.