HYDRAULIC SYSTEM Russian patent published in 1995 - IPC

FIELD: building equipment. SUBSTANCE: hydraulic system consists of a power and a subsidiary cylinders, relief valve, pressure valve, controllable throttle, return valve, and two additional pressure valves. Piston and rod cavities in the power cylinder are connected to feed source and damp through a distributor. Subsidiary cylinder is connected to relief valve outlet, the inlet of which is communicated with piston cavity of the power cylinder, and with pressure valve inlet. Two cavities are there in the subsidiary cylinder. Additional cavity of the cylinder is communicated with power cylinder rod cavity through additional pressure valve with hydraulic control cavity connected to power cylinder piston cavity, and with power cylinder piston cavity through the second additional pressure valve. EFFECT: good controllability. 2 dwg