Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Reexamination Certificate
2006-04-25
2006-04-25
Look, Edward K. (Department: 3751)
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
C251S174000, C251S359000
Reexamination Certificate
active
07032880
ABSTRACT:
A seat assembly extending about an inlet passage of a valve and engaging a valve member is disclosed. The seat assembly includes an annular seat carrier having an annular groove formed therein, and a seat positioned in and extending from the annular groove of the seat carrier. The seat has an inner side, an outer side, and a plurality of spaced apart, concentric seal rings extending from the inner side of the seat to the outer side thereof. The seal ring nearest the inner side of the seat is engageable with the valve member to provide an innermost seal when the seat assembly is acted upon by a pressure within a pressure range and the seal ring nearest the inner side of the seat is deflectable in a radially outward direction and out of sealing engagement with the valve member when the pressure exceeds the pressure range to cause the adjacent seal ring to provide the innermost seal.
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Dunlap Codding & Rogers P.C.
Fristoe Jr. John K.
Look Edward K.
Valve Innnovations, L.L.C.
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