HYDRAULIC CONTROL VALVE Russian patent published in 2019 - IPC F15B13/04 

FIELD: machine building.

SUBSTANCE: invention relates to machine building, particularly, to hydraulic pneumatic automatic control, and can be used to control supply of working fluid to actuating servo-mechanisms in hydraulic drives of various machines. Hydraulic distributor body is made in the form of parallelepiped, and input parts of working fluid supply and discharge channels are located on one of its sides. Piston is made stepped, consisting of central part of larger diameter and rod in form of two peripheral parts of smaller diameter, installed coaxially with central part of piston and located on both sides of it. One peripheral part is made in the form of a piston installed in the corresponding peripheral cavity of the housing, and the other part is made in the form of a stepped cylinder, the diameter of which decreases from the central part to the periphery. One of the surfaces of said stepped cylinder is made in the form of a piston installed in the corresponding central cavity of the housing. At the end of the stepped cylinder there is a working surface interacting with mating working surface of the profiled rod of the specified case. In wall of sleeve there are channels connecting cavity inside sleeve with inlet cavity. Inside the distributor body there is a channel connecting the working liquid outlet cavity and the hydraulic distributor self-supply cavity, in which one of the spring-loaded piston peripheral parts is installed.

EFFECT: improving operating reliability of hydraulic control valve.

1 cl, 2 dwg