John Dalby Icenhower

US Patent:

51296241, Jul 14, 1992

Filed:

Nov 15, 1990

Appl. No.:

7/614142

Inventors:

John D. Icenhower - Sulphur Springs TX
Stephen M. Horvath - Sulphur Springs TX

Assignee:

M&FC Holding Company, Inc. - Wilmington DE

International Classification:

F16K 4104
F16J 1522
F16J 1524

US Classification:

251214

Abstract:

A valve stem sealing means comprising first and second seal assemblies, the first seal assembly being proximate a valve plug and comprising an expandable ring adapted to be expanded by pressure within the valve to effect a first seal around the valve stem, and the second seal assembly being nearer a free end of the valve stem and comprising a second expandable ring adapted to be expanded by contact with a selectively movable member to effect a second seal around the stem.

US Patent:

51783630, Jan 12, 1993

Filed:

May 8, 1992

Appl. No.:

7/879928

Inventors:

John D. Icenhower - Sulphur Springs TX
Stephen M. Horvath - Sulphur Springs TX

Assignee:

M&FC Holding Company, Inc. - Wilmington DE

International Classification:

F16K 4104
F16J 1522
F16J 1524

US Classification:

251214

Abstract:

A valve stem sealing means comprising first and second seal assemblies, the first seal assembly being proximate a valve plug and comprising an expandable ring adapted to be expanded by pressure within the valve to effect a first seal around the valve stem, and the second seal assembly being nearer a free end of the valve stem and comprising a second expandable ring adapted to be expanded by contact with a selectively movable member to effect a second seal around the stem.