Valves and valve actuation – Valve – Seats
Patent
1997-07-23
1999-07-06
Ferensic, Denise L.
Valves and valve actuation
Valve
Seats
1375276, 1663328, F16K 118
Patent
active
059188588
ABSTRACT:
The invention relates to a pair of matched surfaces usable in sealing a downhole subsurface safety valve. The continuous seat and the matching flapper profile feature a surface that is around its periphery transverse to the longitudinal axis of the seat and the flapper. The seating surface, if extended in a two-dimensional plane, defines an undulating shape which can be a sinusoidal shape in the preferred embodiment. The result is an improvement in the performance of the metal-to-metal contact between the seat and the flapper, coupled with a self-centering effect when the seating surface on the flapper, which is formed adjacent a shoulder, is presented in opposition to the seat. Additionally, the transverse undulating seat can have an embedded groove which accommodates a resilient seal, preferably PTFE or Teflon.RTM..
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Beall Clifford H.
Megill Mark S.
Rawson Michael S.
Trott Doug
Baker Hughes Incorporated
Farid Ramyar
Ferensic Denise L.
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