CHECK VALVE Russian patent published in 2016 - IPC F16K15/03 F16K31/08 

FIELD: pipes.

SUBSTANCE: invention relates to valves, namely to control valves for prevention of medium backflow in field pipelines after release of excessive pressure of gas from after-pipe space, and is intended for use in set with wellhead valves in oil production, mainly at low temperatures. Check valve comprises body with hole, seat, hinged gate and permanent magnets. Permanent magnets are arranged in symmetry about vertical axis behind ring, installed in end part of body and protruding beyond its limits with gap. Magnets and ring are arranged coaxially with hole. Hinged gate is equipped with plate, size of which exceeds external diameter of ring. Ring and plate are made of lyophobic material. Width of metal part of gate, extending beyond plate, is equal to or greater than diameter of magnet. End part of body and ring ledge form seat.

EFFECT: invention aims at increase of reliability of check valve, mainly at its operation at low temperatures.

4 cl, 4 dwg