CUTOFF VALVE Russian patent published in 2018 - IPC E21B34/06 F16K17/02 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of oil and gas industry and can be used to block the wellbore when carrying out repair work without plugging. Cutoff valve includes a housing, the internal cavity of which is divided into pressure, discharge and spring installation chambers; a saddle installed in the pressure chamber; a stop element placed in the discharge chamber, pressed to the saddle by a spring through the rod, which is installed in the hole of the internal partition of the housing that separates the drain chamber and the spring installation chamber. Annular protrusion is made on the rod in contact with the body below the internal wall of the body. Side channels are located above the annular protrusion of the stem communicating with the discharge chamber through an axial channel made in the stem and the locking element. Upper end of the stem is made dead. In the discharge chamber, a collet is installed, the heads of the petals of which rest on a conical sleeve fixed to the stem. Seat is mounted on a threaded sleeve fixed in the housing and pressed upward by an elastic element and a nut associated with the housing, thereby having the possibility of limited axial movement upwards.

EFFECT: technical result consists in improvement of reliability of valve.

1 cl, 3 dwg