Actuator with automatic lock
US5025708A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1990 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | Jan 30, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/062
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An improved blowout preventor actuator is provided for opening and closing a ram block within a blowout preventor body to control the flow of well fluid. The working or power piston within the actuator cylinder is provided with one or more axially extending cavities each for receiving a locking rod secured at one end to the cylinder head. To prevent inadvertent opening of the ram block, locking segments carried by the power piston repeatedly disengage one locking surface and re-engage an adjacent locking surface on the locking rods as the power piston and ram block secured thereto move to the ram closed position. To unlock the power piston from the locking rods, fluid pressure is applied to an unlocking piston which radially moves the locking segments out of engagement with the locking rods. The locking surfaces on the locking rods extend axially along a length which allows different ram blocks to be substituted for sealing with various diameter tubular members passing through the blowout preventors. The simple yet highly reliable technique for preventing opening of the BOP ram block increases safety and reduces manufacturing and operating costs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.