Moog Inc. Website
Written by Camilo H Rueda
In 1951, Bill Moog developed the electro-hydraulic servovalve.
In 1951 William C. Moog, Jr. developed the first two-stage servovalve using a frictionless pilot stage. A flapper and nozzle variable
orifice was used in conjunction with a fixed orifice to drive a second-stage
spool in a three-way mode. The flapper-nozzle
valve was driven by a
torque motor, and spool position was achieved by a spring acting directly on the spool.
The advantages of thus construction were an appreciable reduction in valve threshold, and a high dynamic response because of the lower mass of the first-stage parts. Frequency response on the order of 90” at 100 Hz was possible allowing for the use of servovalves in high gain positron servos.
Links:
Moog - Test and Simulation:
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