Valves and valve actuation – Blow-out preventers – Radial reciprocating ram
Patent
1982-01-06
1986-04-15
Schwadron, Martin P.
Valves and valve actuation
Blow-out preventers
Radial reciprocating ram
251 11, 251 77, 251287, E21B 3306
Patent
active
045822930
ABSTRACT:
There is disclosed a ram type blowout preventer in which the chambers in which the rams are received and for movement between opened and closed positions are automatically vented to the bore of the preventer housing above the closed rams, as the rams are moved to open position, in order to equalize pressure across the ram and thus facilitate its opening. When the rams are moved to closed position, this vent is closed so that well pressure beneath the closed rams has access through a groove between the ram and the ram chamber to the chamber behind the closed rams so as to assist operating fluid in maintaining them closed. The stem which connects a piston of a hydraulic system for operating the rams is hollow and so arranged as to be pressure balanced whereby there is substantially no force due to well fluid pressure resisting closing movement of the rams due to the extension of the rod sealably through an opening in a wall separating the ram chamber from the cylinder of the hydraulic system.
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Composite Catalog, 1974-1975, p. 1034, 1980-1981, pp. 1440-1442 and 5216.
Koomey Blowout Preventers, Inc.
Novack Sheri M.
Schwadron Martin P.
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