HYDRAULIC SYSTEM Russian patent published in 1995 - IPC

FIELD: hydraulics. SUBSTANCE: hydraulic dispensers are two-position and three-linear. The inlets and outlets of the hydraulic dispensers are coupled with pump and tank respectively. The working outlet branch pipe of one of the hydraulic dispensers is coupled with under-piston space of the outer hydraulic cylinder, inlet of a controlled valve, and control space of a hydraulic lock. The working outlet branch pipe of the second hydraulic cylinder is connected with control space of the valve and inlet of a check valve of the third hydraulic lock counted from the inlet. The main hydraulic cylinder is provided with additional hydraulic cylinder freely mounted in the bore of the movable rod for permitting axial contact with the piston. The fixed plunger-rod is made up as rod and piston provided at its end. The piston and additional cylinder define the under-piston space connected with the outlet of the hydraulic lock. The under-piston space of this cylinder is in immediate communication with the tank. The piston space of the outer hydraulic cylinder is connected with outlet of the check valve and inlet of the controlled valve. When the hydraulic dispensers are in cut-off position, their outlet branch pipes are connected with their outlets and inlets are closed. When the dispensers are in operation, outlets are closed and inlets are connected with the outlet branch pipes. EFFECT: enhanced reliability. 1 dwg