Actuator with automatic lock
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 25, 1991
Grant Date -
N/A
app pub date -
Jan 30, 1990
filing date -
Jan 30, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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