FIELD: electrical engineering. SUBSTANCE: given hydraulic actuator has cylinder with stepped space and piston with rod mounted for movement along rod within limits of larger step of cylinder. Upper part of cylinder carries brake washer and lower part of it has annular groove. Piston has ring protrusion for interaction with annular groove and is fitted with brake tip for interaction with specified brake washer. EFFECT: simplified design, enhanced functional reliability and safety. 3 cl, 1 dwg
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