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Class Information
Number: 166/332.7
Name: Wells > Valves, closures or changeable restrictors > Longitudinally movable operator > Having equalizing valve
Description: Longitudinally moveable operator including a flow regulating portion that allows pressure inside the tool to be the same as pressure outside the tool.










Patents under this class:

Patent Number Title Of Patent Date Issued
8701781 Subsurface safety valve flapper Apr. 22, 2014
8567506 Fluid isolating pressure equalization in subterranean well tools Oct. 29, 2013
8534361 Multi-stage pressure equalization valve assembly for subterranean valves Sep. 17, 2013
8522883 Debris resistant internal tubular testing system Sep. 3, 2013
8336628 Pressure equalizing a ball valve through an upper seal bypass Dec. 25, 2012
8151888 Well tool with combined actuation of multiple valves Apr. 10, 2012
7913770 Controlled pressure equalization of atmospheric chambers Mar. 29, 2011
7905292 Pressure equalization device for downhole tools Mar. 15, 2011
7762336 Flapper latch Jul. 27, 2010
7472756 Valve apparatus with seal assembly Jan. 6, 2009
7422065 System for controlling zones of fluid in and out of a wellbore Sep. 9, 2008
7204313 Equalizing flapper for high slam rate applications Apr. 17, 2007
7191843 Valve apparatus with seal assembly Mar. 20, 2007
7137450 Electric-hydraulic power unit Nov. 21, 2006
6983803 Equalizer valve and associated method for sealing a fluid flow Jan. 10, 2006
6848509 Pressure equalizing plunger valve for downhole use Feb. 1, 2005
6763892 Sliding sleeve valve and method for assembly Jul. 20, 2004
6644408 Equalizing flapper for down hole safety valves Nov. 11, 2003
6474419 Packer with equalizing valve and method of use Nov. 5, 2002
6347668 Relievable check valve assembly for oil wells and water wells Feb. 19, 2002
6325153 Multi-valve fluid flow control system and method Dec. 4, 2001
6296061 Pilot-operated pressure-equalizing mechanism for subsurface valve Oct. 2, 2001
6283217 Axial equalizing valve Sep. 4, 2001
6237693 Failsafe safety valve and method May. 29, 2001
6112816 Single-phase annulus-operated sliding sleeve Sep. 5, 2000
6109356 Well completion tool having pressure relief capability incorporated therein and associated method Aug. 29, 2000
6079497 Pressure equalizing safety valve for subterranean wells Jun. 27, 2000
5884705 Equalizing valve seat for a subsurface safety valve Mar. 23, 1999
5752569 Flow tube for use in an equalizing subsurface safety valve May. 19, 1998
5704393 Coiled tubing apparatus Jan. 6, 1998
5503229 Equalizing subsurface safety valve Apr. 2, 1996
5156209 Anti blow-out control apparatus Oct. 20, 1992
5156220 Well tool with sealing means Oct. 20, 1992
4991654 Casing valve Feb. 12, 1991
4915175 Well flow device Apr. 10, 1990
4848457 Annulus sliding sleeve valve Jul. 18, 1989
4487261 Well completion and testing system Dec. 11, 1984
4473122 Downhole safety system for use while servicing wells Sep. 25, 1984
4407329 Magnetically operated fail-safe cutoff valve with pressure equalizing means Oct. 4, 1983
4289165 Equalizing ball valve member Sep. 15, 1981
4278131 Port apparatus for well piping Jul. 14, 1981
4134452 Well testing tool Jan. 16, 1979
4094359 Apparatus and methods for testing earth formations Jun. 13, 1978
3981364 Well tubing paraffin cutting apparatus and method of operation Sep. 21, 1976
3930540 Wellbore circulating valve Jan. 6, 1976











 
 
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