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

1992-05-08

1993-01-12

Walton, George L.

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

13724622, 251283, 277 72FM, 277112, 277125, 277DIG6, F16K 4104, F16J 1522, F16J 1524

Patent

active

051783630

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.

REFERENCES:
patent: 3445087 (1969-05-01), Priese et al.
patent: 3537682 (1970-11-01), Priese
patent: 3627260 (1971-12-01), Grove
patent: 4006881 (1977-02-01), Gaillard
patent: 4034776 (1977-07-01), Eshghy
patent: 4174092 (1979-11-01), Macleod
patent: 4260131 (1981-04-01), Kindersley
patent: 4305567 (1981-12-01), Lunt
patent: 4577872 (1986-03-01), Bake
patent: 4640305 (1987-02-01), Johnson
patent: 4930748 (1990-06-01), Gonsior

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