Sealing system for downhole well valves

Details Sealing system for downhole well valves Sealing system for downhole well valves

1986-04-11

1987-06-23

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Longitudinally movable operator

13751629, 166334, 251332, 251359, E21B 3406

Patent

active

046745750

ABSTRACT:
A sealing system for a valve disposed downhole in a subterranean well and subject to a high-temperature and high-pressure environment, comprises an annular valve seat defining a primary annular metallic seating surface surrounded by a groove within which is mounted a nonresilient, nonmetallic sealing element which is spring urged to project axially beyond the end of the primary sealing surface. The valve head is provided by a primary metallic sealing surface which, as the valve head moves toward engagement with the valve seat first engages the nonresilient, nonmetallic sealing element and deflects same axially and concurrently expands it radially outwardly so that the nonmetallic, nonresilient sealing element ends up engaging a cylindrical surface surrounding the primary sealing surface formed on the valve head.

REFERENCES:
patent: 2744539 (1956-05-01), Jones
patent: 2835269 (1958-05-01), Seymour
patent: 3758072 (1973-09-01), Herd
patent: 3809362 (1974-05-01), Baumann
patent: 3986699 (1976-10-01), Wucik, Jr. et al.
patent: 4427071 (1984-01-01), Carmody
patent: 4552233 (1985-11-01), Klima
patent: 4583596 (1986-04-01), Davis

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