Xomox Corporation

Fisher Controls International LLC

Steven M Kirk

Michael J Sandling

Wilbur Dean Hutchens

Timothy Arthur McMahon

M R Ramakrishnan

Brian Nolan

Brian V Nolan

Paul R Hunsberger, Jr

A sealing arrangement and method are disclosed for enhancing a seal in response to conditions of changing temperature. An annular seal is disposed in an annular sealing cavity, with the seal and the cavity having different changes in dimensions in response to a temperature changes. The sealing cavity has a radially outwardly positioned end portion that converges radially outward and a radially inwardly positioned end portion that converges radially inward. Differential changes in the dimensions of the sealing cavity and the sealing member force the sealing material to wedge into one of the converging end portions to enhance the sealing relationship.

Sealing arrangement for thermally enhanced sealing

A stem seal assembly comprises a stem having a top end and a bottom end. The stem is adapted to fit in a valve body and interface with the valving member. A ball segment integral to the stem has a top surface facing upwardly and a bottom surface facing downwardly. A first seal engages the top surface of the ball segment and the second seal engages the bottom surface of the ball segment.

Ball stem seal

A composite sealing unit for sealing between moving parts in a valve is disclosed. The sealing unit has a sealing portion that interfaces with the moving parts and is adapted to isolate a reinforcing portion from media within the valve. The reinforcing portion, which can be encapsulated within the sealing unit, is operative to enhance the resiliency of the sealing unit.

Composite valve seal

A fluid seal for rotary valves wherein a metal seal ring is adapted to fit within a groove formed within the valve body and a retainer ring for sealing engagement with the sealing surface of a closure member. The metal seal ring has a non-symmetrical cross section with the retainer ring side portion including a shoulder engaging the retainer within the groove and a seating portion extending from the groove for sealing engagement with the closure member. A valve body side portion of the metal seal ring includes a shoulder engaging the valve body within the groove and a non-seating portion extending from the groove for a substantially non-sealing and non-engagement with the sealing surface of the closure member. Engagement of the closure member with the seating portion of the retainer side portion of the metal seal ring torsionally loads the cross-section of the seal ring so as to only enlarge the retainer side portion. A resilient material seal ring can be added to the metal seal ring for desired applications. If the resilient material ring is destroyed by high temperatures or fire, the seating portion of the metal seal ring continues to reliably engage the closure member. An elastomeric O-ring can be used on the metal seal ring on a side opposite to the resilient material ring.

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Cincinnati, OH, United States of America

Steven M Kirk