Patent ID: 8132777
Filing Date: 2012-03-13
Classification: E21B

Abstract:
1. A blowout preventer, comprising: a) a body forming intersecting horizontal and vertical passageways extending through the body forming first and second inlet ports for introducing hydraulic fluid to the body, the body having slide studs extending outwardly therefrom; b) a pair of door assemblies, slidably mounted on the slide studs and capable of being releasably secured to the body, each door assembly having a longitudinal bore extending therethrough and further comprising: c) a telescoping hydraulic operator having a first dual-cylinder assembly telescopically connected with a second dual-cylinder assembly, wherein: d) an adapter, slidably received by the door assembly, abutted with and secured in place by the second dual-cylinder assembly, the adapter forming: e) sealing means for reducing leakage from the fourth passageway; wherein fluid flow through the first fluid passageway into the third fluid passageway actuates longitudinal travel of the operator and the door assembly away from body, and longitudinal travel of the actuating means towards the body; and wherein fluid flow through the second fluid passageway into the fourth fluid passageway actuates longitudinal travel of the operator and the door assembly towards the body, and longitudinal travel of the actuating means away from body.