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The MOOG D634‑319C is part of the D634 series of direct‑drive servo (flow control) valves from MOOG. The D633/D634 series uses a permanent‑magnet linear force motor to directly drive the valve spool, eliminating the need for pilot oil. This direct‑drive design enables pressure‑independent dynamic performance, high actuation force with low power consumption, and integrated closed‑loop spool position control.
