CONTROLLED BACK VALVE Russian patent published in 2011 - IPC F16K15/18 

FIELD: machine building.

SUBSTANCE: controlled back valve consists of case 1 with multi-stepped cylinder internal boring 2 and with inlet and outlet channels 3, 4 correspondingly, and of gate 5 with cylinder shank ends 6, 7 on both sides. Inlet and outlet channels 3, 4 are set off one to another relative to axis of multi-stepped cylinder boring 2. Gate 5 is installed inside boring 2 and contacts seat 8 from the side of inlet channel 3. One cylinder shank end 6 of gate 5 is positioned inside ferrule 14 with seat 8. In ferrule 14 there are made orifices 15 in side walls communicating with a cavity of outlet channel 4. Control piston 16 with collar 17 and control cavity 18 are connected with cylinder shank end 6. Device 9 performing reciprocal motions is arranged coaxially to gate 5 in boring 2. Another cylinder shank end 7 is connected with device 9. Device 9 is made as pin 10 with release rod 11 coaxial to it. Device 9 is installed in end cover 12 of case 1.

EFFECT: simplification of valve design and increased maintainability.

2 cl, 1 dwg