HYDRAULIC DISTRIBUTOR Russian patent published in 1998 - IPC

FIELD: road building machinery; hydraulic system control devices. SUBSTANCE: hydraulic distributor has number of working sections, pressure and drain main lines, load main line and controlled safety valve. Each working section has spool, pressure and drain input lines, working output lines, working channels between spool and working output lines, and input and output of load main line. Pressure and drain main lines are connected in parallel to corresponding pressure and drain input lines of working sections. Load main line passes through working sections, and it is connected by first end to input of control safety valve and by second end, to drain main line. At least one working section has piston with springs to fix piston in initial position. Opposite ends faces of piston are connected with working channels. Load main line in this section passes through housing of working section and piston so that, with piston in initial position, input and output of load main line are connected, and with piston in working positions, are disconnected. At least one working channel of working section with pistons can be furnished with check valve. Pusher is installed between piston and check valve to provide operation of such section as hydraulic pilot controlled check valve. With spools and pistons of all working sections in neutral positions, safety valve control input is connected through load main line with drain main line which provides free overflow of working liquid through valve. If check valve is provided, this valve is closed. With spools of working section in working position, pressure differential appears across piston end faces which provides displacement of piston, separation of input and output of load main line and disconnection of safety valve control input from drain main line. Valve remains closed unit pressure in pressure main line rises to setting value. EFFECT: enhanced manufacturability and quality of operation of hydraulic distributor, enlarged operating capabilities. 2 cl, 2 dwg