Valve stem sealing means for prevention of fugitive emissions

Details Valve stem sealing means for prevention of fugitive emissions Valve stem sealing means for prevention of fugitive emissions

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 41/00 (2006.01) F16K 5/02 (2006.01) F16K 41/02 (2006.01)

Patent

CA 2050101

ABSTRACT OF THE DISCLOSURE 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.

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