VERIN HYDRAULIQUE

摘要

The invention relates to hydraulically retractable and extendable hydraulic props in which at least one pressure space is protected via a hydraulically releasable non-return valve fastened to the outer prop. During the admission of pressure to a pressure space producing an opposed direction of movement, this non-return valve is acted upon by the pressure prevailing in this pressure space. The transfer of the control pressure to the hydraulically releasable non-return valve is effected according to the invention via bores in the wall of the outer prop. <IMAGE>