The MOOG servo valve is an electro-hydraulic servo valve designed and manufactured by the American MOOG Company (founded by William C. Moog in 1951). It is the core component of an electro-hydraulic servo control system. This valve can precisely convert weak electrical signals into high-power hydraulic power output. It usually adopts structures such as torque motors, nozzle baffle valves, or jet pipe pilot stages, and has features such as fast dynamic response, high control accuracy, and good reliability. The product series are diverse (such as D660, D661, G761, etc.), and are widely used in aerospace, industrial automation (such as injection molding machines, testing machines, metallurgical equipment), and energy fields.