Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Reexamination Certificate
2005-11-22
2005-11-22
Bastianelli, John (Department: 3751)
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
C251S175000, C277S641000
Reexamination Certificate
active
06966537
ABSTRACT:
A valve is disclosed having a telescoping seat assembly that fits into a pocket or enlargement of a flow passageway through the valve body. An outer seat element seals with the pocket utilizing a plurality of seal assemblies to seal with the pocket whereby pressure may become trapped between the seal assemblies during valve operation under certain unusual conditions. A groove with a tapering or angled surface is provided in the outer seat. A seal ring is disposed in the groove whereby pressure from one side of the seal ring moves the seal along the tapering or angled surface to wedge the seal into contact with the wall of the pocket. Pressure from the other side of the seal ring moves the seal ring along the tapering surface and away from the wall of the pocket so as to be out of sealing engagement thereby permitting bleeding off of the pressure or de-energizing of the seal assemblies.
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Bastianelli John
Nash Kenneth L.
Worldwide Oilfield Machine, Inc.
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