Valves and valve actuation – Blow-out preventers – Radial reciprocating ram
Patent
1989-08-17
1990-07-24
Rivell, John
Valves and valve actuation
Blow-out preventers
Radial reciprocating ram
13763015, E21B 3306
Patent
active
049430319
ABSTRACT:
A blowout preventer having a housing with a bore therethrough and chambers which intersect with rams reciprocable within the chambers between a first position for opening the bore and a second position for closing the bore to divide the bore into zones above and below the rams includes a rod connected to each of the rams and extending longitudinally within each of the chambers and offset relative to the longitudinal axis of the chambers to guide as well as move each of the rams inwardly toward the bore to close the bore and to withdraw each ram from the bore by moving the rams outwardly from the bore in the chamber. A valve is mounted in the end of the rod that is connected with at least one ram to control communication through a passage in the ram wherein the passage has a first passage end that communicates with the zone above the ram and a second passage end that communicates with the chamber adjacent the end of the rod connected to the ram. The valve is movable relative to the rod in which it is positioned to assure that the second passage end will remain engaged thereby should the ram move laterally relative to the chamber.
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Drexel Oilfield Services, Inc.
Hayden Jack W.
Leo L. R.
Rivell John
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