The Moog D636 is a high-performance direct drive servovalve designed for demanding industrial applications requiring precise and dynamic closed-loop control. Its direct drive design utilizes a permanent magnet torque motor, which eliminates the need for a pilot stage, resulting in extremely fast response times, high frequency response, and minimal hysteresis. This model features integrated digital electronics with an analog command interface, simplifying system integration while offering advanced diagnostic capabilities. The robust construction and spring-centered fail-safe position ensure reliable and safe operation in critical systems such as test rigs, simulators, and high-precision manufacturing equipment.