Moog does not authorize any facilities other than Moog or its subsidiaries to repair its servovalves. Repair by an independent, unauthorized facility will void the Moog warranty and could lead to performance degradation or safety issues. It is recommended to contact Moog directly to locate the nearest authorized repair facility.

Moog offers a wide range of servo and proportional valves. The D660 series (including D661 to D665) are servo-proportional control valves used for throttle-type flow control in two, three, four, and five-way applications. They are suitable for high dynamic response requirements in position, speed, pressure, or force control systems. These valves find applications in industrial automation, aerospace, testing and simulation, mechanical manufacturing, and more.