HYDRAULIC LOCK Russian patent published in 1997 - IPC

FIELD: mechanical engineering, hydraulic drives of processing lines and lifting mechanisms. SUBSTANCE: hydraulic lock has housing, shutoff valve forming above-valve and under-valve spaces and first control piston engaging through rod with shutoff valve and forming first control chamber together with housing. Spring-loaded valve with central hole is installed in shutoff valve coaxially with valve at side of above-valve space. Adjustable restrictor with working tip is installed in housing. Working tip is fitted in above indicated hole with radial clearance through which above-valve and under-valve spaces are placed in communication when valve is opened. EFFECT: enhanced reliability of operation. 4 cl, 3 dwg