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Class Information
Number: 166/323
Name: Wells > Valves, closures or changeable restrictors > Fluid operated > Fluid pressure biased to open position position > Locked open or closed
Description: Devices in which the valve element is positively locked in open or closed position to provide flow therethrough in both directions or to prevent flow therethrough in either direction.










Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8549986 Energy storage device, actuator and method Oct. 8, 2013
8539975 Drill string valve and method Sep. 24, 2013
8522877 Sliding sleeve locking mechanisms Sep. 3, 2013
8291981 Shear open valve Oct. 23, 2012
8201623 Reduced wear position indicating subterranean tool Jun. 19, 2012
8196664 Actuating mechanism Jun. 12, 2012
8113286 Downhole barrier valve Feb. 14, 2012
7980316 Formation isolation valve Jul. 19, 2011
7975767 Apparatus for controlling a downhole device Jul. 12, 2011
7909095 Valve device and associated methods of selectively communicating between an interior and an exterior of a tubular string Mar. 22, 2011
7866401 Safety valve for use in an injection well Jan. 11, 2011
7836956 Positional control of downhole actuators Nov. 23, 2010
7810571 Downhole lubricator valve Oct. 12, 2010
7798230 Downhole tool Sep. 21, 2010
7789156 Flapper valve for use in downhole applications Sep. 7, 2010
7779919 Flapper valve retention method and system Aug. 24, 2010
7775283 Valve for equalizer sand screens Aug. 17, 2010
7762336 Flapper latch Jul. 27, 2010
7748462 Actuating mechanism Jul. 6, 2010
7637324 Isolation valve for subsurface safety valve line Dec. 29, 2009
7527104 Selectively activated float equipment May. 5, 2009
7510010 System and method for cementing through a safety valve Mar. 31, 2009
7503390 Lock mechanism for a sliding sleeve Mar. 17, 2009
7409996 Control system communication and lock open tool and method for locking open a safety valve and communicating with surface Aug. 12, 2008
7363980 Downhole flow control apparatus, operable via surface applied pressure Apr. 29, 2008
7360600 Subsurface safety valves and methods of use Apr. 22, 2008
7331392 Pressure range delimited valve Feb. 19, 2008
7303020 Interventionless oil tool actuator with floating piston and method of use Dec. 4, 2007
7281584 Multi-cycle downhill apparatus Oct. 16, 2007
7252149 Safety valve lock out system and method Aug. 7, 2007
7234529 Flow switchable check valve and method Jun. 26, 2007
7210534 Lock for a downhole tool with a reset feature May. 1, 2007
7198109 Double-pin radial flow valve Apr. 3, 2007
7168492 Wellbore annulus flushing valve Jan. 30, 2007
7128160 Method and apparatus to selectively reduce wellbore pressure during pumping operations Oct. 31, 2006
7108071 Automatic tubing filler Sep. 19, 2006
6991040 Method and apparatus for locking out a subsurface safety valve Jan. 31, 2006
6722440 Multi-zone completion strings and methods for multi-zone completions Apr. 20, 2004
6684958 Flapper lock open apparatus Feb. 3, 2004
6666273 Valve assembly for use in a wellbore Dec. 23, 2003
6662877 Formation isolation valve Dec. 16, 2003
6508309 Valve assembly Jan. 21, 2003
6494269 Downhole apparatus for controlling fluid pressure Dec. 17, 2002
6397949 Method and apparatus for production using a pressure actuated circulating valve Jun. 4, 2002
6386289 Reclosable circulating valve for well completion systems May. 14, 2002
6352118 System and method for communication hydraulic control to a wireline retrievable downhole device Mar. 5, 2002
6349770 Telescoping tool Feb. 26, 2002
6328055 Annulus pressure referenced circulating valve Dec. 11, 2001
6293342 Bypass valve closing means Sep. 25, 2001
6250383 Lubricator for underbalanced drilling Jun. 26, 2001

1 2 3 4










 
 
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