REVERSIBLE CHECK VALVE Russian patent published in 2012 - IPC F16K15/04 F16K1/34 E21B34/08 

FIELD: machine building.

SUBSTANCE: reversible check valve includes cylindrical body 1 with stepped hole 3. Direct-acting and reverse-acting valves are arranged in it. Reverse-acting valves include shutoff elements 15 and 16 with mounting seats 13 and 14 with inlet and outlet fluid passage channels. There is return spring 19 for reverse-acting valve, which interacts with adjusting nut 23. Valve is equipped with stepped cylindrical valve module 4 installed in hole 3 of housing so that annular gaps 5 and 6 are formed. In module 4 there made are opposite directed holes 9 and 10 for installation of mounting seats 13 and 14 of direct-acting and reverse-acting valves. Seats 13 and 14 are located on the axis coinciding with axis of body 1. Holes 9 and 10 are connected to non-crossing inclined fluid passage channels 11 and 12 respectively. Shutoff element 15 of direct-acting valve and limit stop 17 of its movement are installed in upper part of module 4. Shutoff element 16 of reverse-acting valve is arranged in lower part of module 4 with possibility of interaction with limit stop 20. Limit stop 20 is installed on the other end of return spring 19, equipped with mounting hole 21 for shutoff element 16 and fluid passage holes 22.

EFFECT: higher reliability, improved reparability, easy erection and longer service life of valve.

6 cl, 4 dwg