VALVE Russian patent published in 2019 - IPC E21B34/06 

FIELD: oil industry.

SUBSTANCE: invention relates to the petroleum industry and is intended for draining liquid from a string of pumping pipes before lifting them out of a well. Device includes a branch pipe, a nozzle with a hole, with a thread on the outer side wall, with an elongated end, where there is a hole, and with a cylindrical head with a hexagonal hole, a ball. Connecting rod is made of two separate parts, one of which is in the form of an elongated end with a ball-shaped ledge, and the other one is in the form of a mating part of the nozzle with a spherical wall for tight fitting of the ball-shaped ledge. Elongated end of nozzle is made with possibility of turning downwards under action of ball. Centre of spherical ledge lies on axis of elongated end of nozzle. Hole on the elongated end of the nozzle is drilled from the free end to the centre of the spherical ledge, and this end of the nozzle extends from the spherical wall of the nozzle into the cavity of the branch pipe. On the side wall of the hole of the nozzle between the spherical wall and the bottom of the hexagonal hole of the cylindrical head the internal thread is cut, where the bushing with external thread is wrapped, with two radial slots on one end and a convex spherical wall on the other end. Spherical wall hub rests against wall of ball-shaped protrusion and closes in discharge position valve radial holes made on said ledge. Cavities of radial holes of projection are communicated with cavity of hole of elongated end of nozzle.

EFFECT: increasing serviceability, increasing service life.

1 cl, 4 dwg