HYDRAULIC SYSTEM Russian patent published in 1995 - IPC

FIELD: oil industry. SUBSTANCE: working spaces of a reverse hydraulic motor are in communication with power source and drain through a distributor. A control unit is positioned in hydraulic lines between the hydraulic motor and distributor. The control unit is constructed as two parallel cylinders with plungers. One space of the first cylinder and opposite space of the second cylinder is connected with hydraulic lines immediately. The second space of the first cylinder and the first space of the second cylinder are connected with the check valve through a throttle which is connected in parallel to the valve. Each cylinder is provided with the drain passage made in the housing from the side of the space immediately connected to the hydraulic lines. The distance between the drain passage and the face of the cylinder is less than the length of the plunger. EFFECT: enhanced reliability. 1 dwg