Annular blowout preventer

Details Annular blowout preventer Annular blowout preventer

1981-12-28

1984-07-17

Schwadron, Martin P.

Valves and valve actuation

Blow-out preventers

251212, 277235R, E21B 3306

Patent

active

044601506

ABSTRACT:
An improved annular blowout preventer having a housing, an annular packer mounted in the housing, and a piston mounted in the housing for the application of an axial force to the annular packer; the annular packer includes a resilient annulus with a circular series of rigid interengaging inserts embedded in its upper face with the inner ends of the inserts being thicker than the outer ends so that the inner ends of the inserts move inward as the resilient annulus is moved and interengaging side projections and recesses with shoulders to ensure substantially uniform inward movement of the inner ends of the inserts to a preselected inner support position for the resilient annulus.

REFERENCES:
patent: 3915424 (1975-10-01), LeRouax
patent: 4256314 (1981-03-01), Berglund et al.
patent: 4310139 (1982-01-01), Williams et al.

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