Annular blowout preventer

Details Annular blowout preventer Annular blowout preventer

1982-09-16

1984-07-10

Schwadron, Martin P.

Valves and valve actuation

Blow-out preventers

251212, E21B 3306

Patent

active

044588763

ABSTRACT:
An annular blowout preventer having a body with a central bore, a piston chamber, and a packer chamber surrounding the central bore, a piston in the piston chamber, an annular packer in the packer chamber, the annular packer including a resilient annulus and a plurality of metal irising inserts embedded in the annulus and having upper triangular plates, lower triangular plates, a stem connecting the plates and means interconnecting adjoining plates to avoid inadvertent separation of one or more of said inserts, the annular packer moving between open and closed positions responsive to movement of the piston.

REFERENCES:
patent: 3915424 (1975-10-01), LeRouax
patent: 3915425 (1975-10-01), LeRouax
patent: 4099699 (1978-07-01), Allen

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