E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 34/04 (2006.01) E21B 33/035 (2006.01)
Patent
CA 2078675
A subsea actuator for operating a valve (20) or the like comprises a movable wall member (19) fixed to an axially slidable T stem and separating a pressure chamber (2) from a space (3) which is subjected to the hydrostatic pressure of ambient seawa- ter. A selector valve (11) is operable to connect the chamber (2) to a source of pressurized fluid, e.g. a source of pressurized gas (14), or to a drain e.g. connected to atmosphere by a pressure vessel (12) and pipe (15). A blowdown valve (16) and dump valve (13) are provided for ejecting liquid collected in the vessel (12). The space (3) may be connected to an open-bottomed container (17) to provide a gas barrier between the seawater and the interior of the actuator. Supply of pressurized gas to the chamber (2) causes the member (19) to be driven forwards, gas being allowed to flow past the member into the space (3) during this movement to assist the expulsion of water from the container (17) and the expulsion of any contaminants from within the actuator. When the chamber (2) is connected to atmospheric pressure the hydrostatic pressure of the seawater causes the member (19) to be driven in the reverse di- rection.
Dowdall Dennis Stephen
Loth William Dennis
Dowdall Dennis Stephen
Loth William Dennis
Sim & Mcburney
W.d. Loth & Co. Ltd.
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