Annular type blowout preventer

Details Annular type blowout preventer Annular type blowout preventer

1975-01-17

1976-11-30

Schwadron, Martin P.

Valves and valve actuation

Blow-out preventers

251 9, 277128, E21B 3306

Patent

active

039944727

ABSTRACT:
There is disclosed an annular blowout preventer wherein a plurality of flexible bands are arranged about the packer within the recess about the bore through the preventer housing, and means are provided for moving the bands toward and away from the bore so as to selectively contract the packer into sealing engagement about an object in the bore or upon itself when the bore is empty or permit said packer to expand into the recess.

REFERENCES:
patent: 2434835 (1948-01-01), Colley
patent: 2609836 (1952-09-01), Knox
patent: 3572627 (1971-03-01), Jones
patent: 3737139 (1973-06-01), Watts

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