Fluid handling – Processes – Cleaning – repairing – or assembling
Reexamination Certificate
2005-10-18
2005-10-18
Krishnamurthy, Ramesh (Department: 3753)
Fluid handling
Processes
Cleaning, repairing, or assembling
C137S902000, C251S359000, C277S316000
Reexamination Certificate
active
06955181
ABSTRACT:
A valve seal assembly comprising a valve body having one or more peripheral integral seal retention grooves and one or more peripheral elastomeric seals, each seal being cast-in-place in an integral seal retention groove having adhesion-inhibiting surfaces and offset circular serrations of predetermined height on opposing groove walls. Adhesion-inhibiting surfaces reduce or eliminate internal elastomer stress due to curing of cast-in-place elastomeric seals. Serrations on each of the opposing groove walls are offset to accommodate differing stress concentrations in the walls. Opposing groove walls preferably diverge peripherally. Offset serrations result in decreased metal fatigue from impact and bending stress. Offset serrations also improve valve sealing and increase valve service life by maintaining correct seal position on the valve body while minimizing background stress in the seal elastomer. In representative valve applications, serration height is preferably predetermined so that the cured elastomeric seal remains interdigitated with the serrations for greater than half of the predetermined serration height.
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Gilstad Dennis W.
Krishnamurthy Ramesh
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