ELECTRO-HYDRAULIC ACTUATING APPARATUS FOR A CONTINUOUSLY ADJUSTABLE VALVE

摘要

An electro-hydraulic actuating apparatus for a continuously adjustable servo-valve comprises a regulator which delivers an error signal (F3) depending on the regulating departure. Upon exceeding their limiting value, two comparators each associated with one direction of adjustment are caused by the error signal to deliver an output signal for operating a control valve arrangement having magnetic valves. The error signal (F3) is formed by an A.C. voltage with at least one inclined flank, of which the mean value (M) depends on the regulating departure and the half-period is larger than the reaction time of the magnetic valves.