CONTROL VALVE Russian patent published in 2009 - IPC F16K17/04 F16K21/10 

FIELD: machine building.

SUBSTANCE: control valve comprises body closed with cover. Openings for supply and drain of working fluid are located at side surface of body at a distance to each other. Cover is made with an opening for connection to control line. Shell is installed in body. Central opening of shell is made as stepped. Open side of shell is inverted to body cover. Inlet openings are arranged in the area between shell step and its open end side on shell side surface. These openings connect internal cavity of shell with opening for supply of working fluid. Outlet and control openings are arranged in the area between shell step and its bottom at side surface of shell at a distance to each other. Main valve is installed in shell. Main valve is made with through long stepped opening, which creates internal cavity of main valve. Main valve is installed in shell with the possibility of displacement along its internal surface as along guides between step and shell bottom. Shell step serves as seat for main valve. On side surface of main valve there are openings for connection of internal cavity of main valve to drain opening of body through outlet openings of shell. On the side of main valve inverted to cover, there are slots provided for connection of internal cavity of main valve to supply opening of body through inlet openings of shell. Main valve is spring-loaded relative to shell with spring of main valve installed between main valve and shell bottom. There is a plunger with tail installed inside main valve with the possibility of displacement along its internal surface as along guides. Step of main valve serves as seat for plunger tail. Plunger is spring-loaded relative to main valve with a plunger spring. Spring of main valve and plunger spring are installed serially. Unloading chamber is created between shell bottom and main valve. Openings are provided in plunger. These openings alternately connect unloading chamber either with a drain hole of body through openings at side surface of main valve and outlet openings of shell - when plunger tail sits on main valve step, or via annular gap between sealing external surface of plunger tail and step of main valve and via inlet opening of shell with supply opening of body - when plunger tail does not sit on main valve step. Valve is equipped with stem. Stem is installed with the possibility of action at plunger tail with further action at main valve during stem displacement under action of pressure from control line.

EFFECT: improved reliability of control valve operation and simplification of its design.

5 cl, 2 dwg