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US 3,986,699 AGranted
Positive shut-off seal
AssigneePosi-Seal International, Inc.
InventorsJoseph A. Wucik, Jr., John E. Burdick, James P. Azzinaro
Life of this patent
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AssigneePosi-Seal International, Inc.
InventorsJoseph A. Wucik, Jr., John E. Burdick, James P. Azzinaro
Estimating the term…
A positive shut-off seal mechanism for use in pressurized fluid systems subject to high temperatures or fire risk. The seal mechanism includes a metallic valve seat in the form of an annular thin-walled skirt-like lip, preferably formed in a valve seat insert ring or retaining ring, the lip extending generally upstream toward the high pressure side of the valve. The edge of the lip engages a mating circumferential sealing surface of a valve disc, preferably at a location downstream from the plane of maximum disc diameter, with an interference fit to provide a preloaded radial sealing force between the edge of the lip and the sealing surface of the disc. The annular lip preferably forms the downstream side of an undercut groove for a resilient seal ring that provides a primary seal, the engagement of the lip edge with the sealing surface of the valve member providing a metal-to-metal backup seal in the event of damage to or destruction of the resilient seal ring. The valve disc material has preferably a coefficient of thermal expansion at least equal to that of the annular lip to maintain or increase sealing effectiveness with increasing temperature.
An improved positive shut-off seal mechanism for a valve of the type that includes a valve body having an inlet opening, an outlet opening and a connecting passageway for providing a flow path for fluid from the inlet to the outlet, a first annular surface defined in the wall of the passageway circumscribing the fluid flow path at a location between the inlet and the outlet, a valve disc having a second annular surface difined on its circumference, one of said first and second annular surfaces forming a seating region and the other annular surface forming a sealing surface, and means for pivotally mounting the valve disc in the passageway for selective rotation of the second annular surface into and out of opposed mating relation with the first annular surface, the improved seal mechanism comprising:
An improved positive shut-off seal mechanism for a pressurized fluid system of the type that includes a structure having a passageway with an inlet and an outlet for fluid flow, a valve seat in the passageway circumscribing the fluid flow path at a location between the inlet and outlet, a valve member having a circumferential sealing surface, and means for mounting the valve member in the passageway for selectively engaging and disengaging the sealing surface of the valve member with the valve seat for respectively preventing and permitting fluid flow therethrough, the improved seal mechanism comprising:
An improved positive shut-off valve for a fluid system of the type that includes a valve body having a passageway with an inlet and an outlet for fluid flow, an annular seating region defined by an interior surface of the passageway circumscribing the fluid flow path at a location between the inlet and the outlet, and a passageway closure member having a circumferential sealing surface of decreasing circumference in the downstream direction adapted to mate with the seating region when placed in opposed relation thereto to prevent fluid flow between the inlet and the outlet, the improved valve comprising:
Dependencies are inferred from the claim text.