SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
Servomotors with follow-up action,; e.g. obtained by feed-back control,; i.e. in which the position of the actuated member conforms with that of the controlling member
in which both the controlling element and the servomotor control the same member influencing a fluid passage and are connected to that member by means of a differential gearing
