HYDRAULIC VALVE Russian patent published in 1995 - IPC

FIELD: hydraulics. SUBSTANCE: second ring bore is made in the chamber of a valving member. The bore is in communication with the member for connecting to the reverse flow. In addition the second seat having a cylindrical part and interposed between the bore is mounted inside the housing. The first seat is provided with a sealing ring. Similar openings are made in the piston from the side of connection of a pump. The outer side of the surface is provided with a ring groove, wherein a sealing member is received, and ring groove the space of which is in communication with longitudinal openings. When the valve is closed, the ring groove of the piston is in front of the sealing ring of the first seat for permitting connection of the consumer connecting member with the connecting member of the reverse flow through the ring groove made in the piston. When the valve is open, the ring groove of the piston is arranged behind the sealing ring of the first seat. The sealing member of the piston is arranged behind the first bore of the chamber overlapping the path from the member for connecting a consumer to the member for connecting of the reverse flow due to the tight abutting against the cylindrical part of the second seat. EFFECT: enhanced reliability. 4 cl, 10 dwg