Blowout preventer with ram wedge locks
US5575452A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1995 |
| Grant date | Nov 19, 1996 |
| Priority date | — |
| Expiry date | Sep 1, 2015 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/062
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulically controlled ram actuating mechanism 10 for a blowout preventer controls the opening and closing of a ram block 12 interconnected with a ram 14 movable within a ram housing 26 along ram axis 16. The ram piston 24 and a locking piston 62 are each movable within the ram housing in response to fluid pressure. The locking piston includes a plurality of substantially planar tapered locking piston surfaces 72 circumferentially arranged on the exterior of the locking piston and inclined at an acute positive cam angle. A plurality of locking rods 40 are each secured to the ram housing 26 and are circumferentially spaced about the locking piston, with each locking rod including a substantially planar tapered locking rod surface 82 thereon inclined at an acute negative cam angle. A plurality of locking segments 60 are each spaced radially between a locking rod and the locking piston, with each locking segment adapted for being sandwiched between the locking surfaces for preventing opening of the ram until the locking piston is moved in response to fluid pressure. The actuating mechanism reliably controls the flow of well fluids through the blowout preventer and may be automatic…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.