HYDRAULIC DRIVE FOR CONTROL VALVE GATE Russian patent published in 1995 - IPC

FIELD: hydraulics. SUBSTANCE: rod of the piston of two-space hydraulic cylinder is mechanically coupled with the gate interposed between the inlet and outlet branch pipes. The spaces of the hydraulic cylinder are in communication with the inlet branch pipe and drain pipe line through a distributor. The piston is provided with a rod mounted coaxially to it. The drain pipe line is in communication with the space of the accumulator and with the outlet branch pipe through a check valve. The hydraulic cylinder is provided with a dummy branch pipe with radial pocket. The side surface of the rod is provided with hollows. The rod is mounted for permitting movement in the plane of the axial dummy branch pipe. The piston is provided with a locking member mounted inside the pocket for interaction with the hollows made in the rod. EFFECT: enhanced reliability. 3 cl, 2 dwg