SECTIONAL HYDRAULIC DISTRIBUTOR WITH PROPORTIONAL ELECTROHYDRAULIC CONTROL Russian patent published in 2002 - IPC

FIELD: hydraulic control systems. SUBSTANCE: proposed hydraulic distributor has delivery section with delivery main line, drain section with drain main line and overflow channel, electrically controlled spool-type hydraulic distributors of first stage connected to hydraulic control line communicating with delivery main line through reducing valve and filter, working sections formed by spool-type hydraulic distributors of second stage, adjustable throttle installed in overflow channel of drain section after spool-type hydraulic distributors of second stage. Hydraulic distributor of second stage is six-way, with overflow channel open in neutral position of spool. Radial delivery and drain holes are made in body of cylindrical spool. Ball-type check valves installed in channels preclude reverse flow of working liquid when section is placed in working position. Ring groove forms overflow channel with grooves of housing of working section. Width of spool groove does not exceed width of working belt. EFFECT: improved reliability. 5 dwg