REGULATING HYDRAULIC APPARATUS Russian patent published in 2001 - IPC

FIELD: positive- displacement hydraulic drives; control of actuating hydraulic mechanisms in proportional and/or on-off mode. SUBSTANCE: hydraulic apparatus includes pressure and return hydraulic lines, one or several working hydraulic distributors equipped with electrically- controlled hydropilots, hydraulic control line connected with pressure hydraulic line via filter and pressure-reducing valve, overflow two-line hydraulic distributor whose one hydraulic line is connected with pressure hydraulic line; hydraulic distributor is provided with electrically-controlled hydropilot; hydraulic apparatus is additionally provided with return hydraulic distributor whose one hydraulic line is connected with second hydraulic line of overflow two-line hydraulic distributor and its second line is connected with return hydraulic line; return hydraulic distributor is hydraulically controlled due to coupling with control hydraulic line; return hydraulic distributor is two-position two-line distributor provided with hydraulic throttle valve in one position; check valve is fitted between pressure-reducing valve and control line. EFFECT: enhanced reliability. 4 cl, 1 dwg