SELF-CONTAINED SHUTOFF DEVICE Russian patent published in 2012 - IPC E21B34/06 

FIELD: oil and gas industry.

SUBSTANCE: device includes housing, shutoff valve with a seat and a plate, and a lock. According to the invention, the device includes potential energy accumulator installed on stop ring in the housing and retaining-releasing mechanism fixed in the housing and equipped with fixing elements; plate is made in the form of a drum the flanges of which are equipped with seals, on the outer surface of which there is conical groove having the possibility of interacting with fixing elements and inside which there arranged is feedthrough flow channel having the conical shape with flare from inlet to outlet. Cylindrical surface at the outlet has replaceable nozzle installed in feedthrough flow channel at the inlet and is adjacent to potential energy accumulator. Seat includes circulation channels on its annular part and has a lug formed with cylindrical surface with possibility of being adjoined to cylindrical surface of feedthrough flow channel and spherical surface provided with spherical edge and having the possibility of being adjoined to conical surface of feedthrough flow channel at the outlet. At that, sealed cavity for retaining-releasing mechanism is formed between housing and outer surface of the plate in the form of a drum.

EFFECT: providing the possibility of flow passage in both directions, covering of feedthrough flow channel and opening of this channel when the shutoff member returns to initial position.

3 cl, 1 dwg