Joseph Shoaf
Engineers at Kings Country Dr, Irving, TX
License number
Colorado 1484
Issued Date
Dec 16, 1950
Renew Date
Jan 10, 1992
Expiration Date
Jan 10, 1992
Type
Professional Engineer
Address
Address
2341 Kings Country Dr, Irving, TX 75038
Professional information
Oil And Gas Well Safety Valve
US Patent:
4706933, Nov 17, 1987
Filed:
Sep 27, 1985
Appl. No.:
6/780793
Inventors:
Richard A. Sukup - Burleson TX
Joseph Shoaf - Irving TX
Joseph Shoaf - Irving TX
International Classification:
F16K 120, F16K 31122, F16K 4708
US Classification:
251 54
Abstract:
An oil or gas well flapper-type safety valve is joined in the tubing string and has a cylindrical valve body with a valve seat therein. A flapper valve is hingedly supported from the valve body for movement between a closed position wherein the valve is seated against the seat and an open position wherein the valve is pivoted from the seated position. A control link is attached to the flapper valve at a point removed from the hinge. Control structure is provided for applying a force to the valve through the control link to selectively pivot the valve between its closed and open position. The control structure includes an hydraulically operated piston moveable in a valve control cylinder. The piston is attached to one end of the control link and is biased by a compression spring toward the valve to seat the valve. A pressure supply is communicated to the cylinder in which the piston moves and by applying pressure to the piston to overcome the bias provided by the compression spring, the piston moves downwardly in its cylinder.