Valve actuator having a continuously charged accumulator

F - Mech Eng,Light,Heat,Weapons – 15 – B

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F15B 13/00 (2006.01) E21B 29/04 (2006.01) E21B 29/08 (2006.01) E21B 34/02 (2006.01) F16K 17/00 (2006.01) F16K 31/00 (2006.01)

Patent

CA 1063085

TITLE: VALVE ACTUATOR HAVING A CONTINUOUSLY CHARGED ACCUMULATOR ABSTRACT OF THE INVENTION An actuator is provided which is respondable to control fluid pressure for moving an operative means of a valve between open and closed positions. The actuator comprises a housing defining a cylindrical bore therewithin. In one form, a shaft is carried in the housing and is engagable with the operative means. Means define first and second effective piston areas and are carried by one of the shaft and the housing and are sealingly slidable along the other of the shaft and the housing, being longitudinally movable within the cylindrical bore. The apparatus has first and second fluid chambers companionly associated with the means de- fining the first and second effective piston areas within the bore for yielding a differential force across the means defining the first and second effective piston areas upon increase of fluid control pressure within the actuator. A continuously chargeable fluid accumulator means is in fluid communication with the second fluid chamber for storage of energy defined by fluid, preferably control fluid, compressible therein. Fluid passage means for transmitting fluid under pressure is provided to said first fluid chamber and to said accumulator means. Valve means are movable between open and closed positions and communicate between the accumulator means and the fluid passage means to permit fluid control pressure charging of the accumulator chamber when the valve is in the open position and for preventing discharge of fluid pressure within the accumulator chamber when the valve is in the closed position. The valve is responsive to pressure differential between the accumulator chamber and the fluid passage means. The shaft is selectively shiftable longitudinally in a first direction to move the operative means to one of open and closed positions, preferably by increase in fluid control pres- sure, the shaft being selectively shiftable longitudinally in a second direction to move the operative means to the other of the open and closed positions upon, preferably, subsequent de- crease in fluid control pressure and release of energy stored within the accumulator. -2-

283029

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