Valves and valve actuation – Mechanical movement actuator – Particularly packed or sealed
Patent
1996-02-12
1997-02-11
Fox, John C.
Valves and valve actuation
Mechanical movement actuator
Particularly packed or sealed
251304, F16K 4106
Patent
active
056012764
ABSTRACT:
A retrofit valve stem seal assembly, which can be retrofitted to existing quarter-turn valves already in service, is provided. The retrofit valve stem seal assembly is added to the valve stem by inserting a valve stem adaptor onto the valve stem and firmly attaching the adaptor to the valve stem. The inner surface of the valve stem adaptor fits on the valve stem. To prevent leaks between the valve stem adaptor and the valve stem, "O" rings are installed in the valve stem adaptor to bear against the valve stem. A rotatable valve stem adaptor includes a sliding tractrix surface for sliding contact with a stem packing. The stem packing includes a complementary tractrix surface for contacting the sliding tractrix surface on the valve stem. Wear between the contacting surfaces is uniform at all points of contact between the sliding tractrix surface and the complementary tractrix surface, creating and maintaining a dynamic seal. The stem packing also includes an outer cylindrical surface for contacting a complementary cylindrical surface of the valve bonnet creating and maintaining a static seal.
REFERENCES:
patent: 4328974 (1982-11-01), White et al.
patent: 4878652 (1989-11-01), Wordin
patent: 5044606 (1991-09-01), Wordin
H. W. Reddik and F. H. Miller "Advanced Mathematics For Engineeers" John Wiley and Sons 1955 pp. 102-103.
"Marks Standard Handbook for Engineers" T. Brumeister, Editor 8th Edition McGraw-Hill Book Co. 1979 pp. 2-41.
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