Valves and valve actuation – With means to increase head and seat contact pressure – Gate valve
Reexamination Certificate
2007-12-11
2007-12-11
Huson, Gregory (Department: 3753)
Valves and valve actuation
With means to increase head and seat contact pressure
Gate valve
C251S327000, C251S328000
Reexamination Certificate
active
11205751
ABSTRACT:
A gate valve for controlling fluid flow, in which a valve body forms a cylindrical flowbore and includes a gate cavity intersecting the flowbore to provide opposed openings into the flowbore. Seat pockets are formed in the opposed openings, each with a radial base and a side wall, and may optionally include metal carrier ring sealed in the seat pockets. The gate is slidably movable within the valve body between open and closed positions. Annular seat elements are mounted in each seat pocket for limited axial movement on opposite sides of the gate, with a first seal surface for sealing against the seat pocket or optional carrier ring, and a second seal surface for sealing against the gate. A non-metallic bridging seal formed as a face seal is provided between the first seal surface of the annular seat element and the seat pocket (or optional carrier ring). The bridging seal is adapted to bridge any gap formed at the first seal surface of the annular seat element such that sealing engagement is maintained across the gap at all times as the gate moves between open and closed positions, while still permitting the limited axial movement of the annular seat element. Preferred embodiments of the bridging seal include tongue and groove seals and bridge ring inserts. A second seal to the seat pocket is also preferred.
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Undated trade sales and information brochure for Cameron FL, FLS, and FLS-R Gate Valves.
Undated trade sales and information datasheet for Bel Valves Thro Conduit Gate Valves.
Undated trade sales and information brochure for FMC Surface Wellheads 100 Series Gate Valves (models 110, 120, 130, 140).
FMC Surface Wellheads (visited Jan. 10, 2002) “Model 130 Gate Valve” [www document] URL http://fmcwellhead.com/FMC/surface/—surface—product—display—detail—action/1,6562....
Fristoe Jr. John K.
Greenlee Winner and Sullivan PC
Huson Gregory
Stream-Flo Industries Ltd.
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