Annular blowout preventer with upper and lower spherical sealing

Details Annular blowout preventer with upper and lower spherical sealing Annular blowout preventer with upper and lower spherical sealing

1981-06-19

1984-07-17

Schwadron, Martin P.

Valves and valve actuation

Blow-out preventers

277 31, 277188A, 277235R, E21B 3306

Patent

active

044601492

ABSTRACT:
An annular blowout preventer for use on an oil or gas well rig having a lower housing, an upper housing, a resilient sealing means, a vertical bore coaxially positioned through the housing and a vertically acting piston for actuating the sealing means in which the inner surface of the upper housing and the inner surface of the lower housing are concentric spherical surfaces extending to the bore. The resilient sealing means includes steel segments extending between the top and bottom of the sealing means and the top and bottom of the sealing means and the steel segments have spherical surfaces coacting with the spherical surfaces on the upper and lower housings. The upper and lower housings each include a vertical wall extending downwardly from the spherical surfaces on the upper and lower housing and the vertical moving piston sealingly engages the vertical walls.

REFERENCES:
patent: 2164857 (1939-07-01), MacClatchie
patent: 2846178 (1958-08-01), Minor
patent: 3323773 (1967-06-01), Walker
patent: 3561723 (1971-02-01), Cugini
patent: 3572628 (1971-03-01), Jones
patent: 3626505 (1971-12-01), Douglas
patent: 3631767 (1972-01-01), Meier
patent: 3667721 (1972-06-01), Vujasinovic
patent: 4099699 (1978-07-01), Allen
patent: 4283039 (1981-08-01), Schaeper et al.

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