Butterfly type valve seal
AssigneeUnited Aircraft Products, Inc.
InventorDennis W. DeSalve
Life of this patent
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Abstract
A pivotally adjustable valve disc has a ring seal set in its grooved periphery for contact with a wall of a valve accomodating bore. A flexible, radially expansible member is in the valve groove in a backing relation to the ring seal. Passages admit pressure fluid from the upstream side of the valve disc to the valve groove where the applied pressure is exerted through the radially expansible member toward a radial expansion of the ring seal. In its pressured contact with the seal, the radially expansible member blocks pressure fluid escape through gaps and interfacial joints therein.
Claims4
A butterfly type valve element in disc form controlling flow of a fluid through a valve accomodating bore, said valve element having a peripheral groove, plural split ring seals in a face to face relation installed independently of one another in said groove to substantially fill said groove in a longitudinal sense, inner peripheries of said seals being spaced radially outwardly from the bottom of said groove, means for admitting pressure fluid to said groove at a location radially inwardly of the inner peripheries of said seals, and means in said groove radially inwardly of the inner peripheries of said seals and overlying the joint or joints between said seals utilizing the pressure of admitted pressure fluid in said groove to apply a radially expanding pressure substantially uniformly to said ring seals and without a loss of fluid pressure through said joint or joints.
Dependencies are inferred from the claim text.