SLIDING HUB, WHICH HAS OBLIQUE TAPERING SEGMENTED BALL SEAT Russian patent published in 2017 - IPC E21B34/14 E21B43/26 

FIELD: mechanical engineering.

SUBSTANCE: sliding hub comprises a housing, which defines a first channel and a constitutive dispensing opening, that connects the first channel on the outside of the housing environment; an inner hub, which defines a second channel and movable from a closed position to an open position within the first channel relative to the dispensing opening; inward-facing surface, placed in the second channel and inclined from the proximal end toward the distal end of the inner hub; and a seat, disposed in the second channel of the inner hub and displaceable in the axial direction from the first axial position towards the second axial position. The seat has a plurality of segments, which have inclined surfaces. The inclined surfaces extend from the proximal end to the second distal end of the second seat and adapted to engage the inwardly facing surface. Segments on the seat in the first axial position are adapted to move apart the outwardly relative to each other and form a protrusion for engaging with a discarded plug. The protrusion is disposed between the second proximal and distal ends of the seat. Segments on the seat are moved towards the second axial position by inwardly converging inclined surfaces by means of engaging with inwardly facing wedging surface and went down on the seat projection engages the plug. The seat axially moves the inner hub to the open position in response to fluid pressure, applied to the engaging plug.

EFFECT: provision of wedged landing plugs in the seat for the perception of a high pressure, relief of plug crushing, elimination of its chipping or cutting on the sides.

22 cl, 16 dwg