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Class Information
Number: 166/325
Name: Wells > Valves, closures or changeable restrictors > Fluid operated > One way, e.g., check valve type
Description: Devices in which the valve allows flow of fluids in one direction, but closes upon the reversing of flow in the opposite direction (check valve type).










Sub-classes under this class:

Class Number Class Name Patents
166/326 Flexible valve element 35
166/327 Shoes with check valve 53


Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8701780 Hydraulically driven, down-hole jet pump Apr. 22, 2014
8668015 Dual check valve Mar. 11, 2014
8657015 Intelligent completion system for extended reach drilling wells Feb. 25, 2014
8636058 Straight-bore back pressure valve Jan. 28, 2014
8590629 Flow stop valve and method Nov. 26, 2013
8579032 Casing annulus management Nov. 12, 2013
8561703 Compliant dart-style reverse-flow check valve Oct. 22, 2013
8474535 Well screen inflow control device with check valve flow controls Jul. 2, 2013
8469089 Process and apparatus to improve reliability of pinpoint stimulation operations Jun. 25, 2013
8448659 Check valve assembly for well stimulation operations May. 28, 2013
8403052 Flow control screen assembly having remotely disabled reverse flow control capability Mar. 26, 2013
8336627 Retrievable inflow control device Dec. 25, 2012
8251155 Method of running DTS measurements in combination with a back pressure valve Aug. 28, 2012
8225874 Gas lift valve assembly and method of using Jul. 24, 2012
8113289 Flow regulator for downhole progressing cavity motor Feb. 14, 2012
7980313 Method and apparatus for catching a pump-down plug or ball Jul. 19, 2011
7946347 Injection valve May. 24, 2011
7896091 Convertible seal Mar. 1, 2011
7891432 Apparatus and methods for setting one or more packers in a well bore Feb. 22, 2011
7814982 Downhole non-return valve and method Oct. 19, 2010
7793732 Backpressure valve for wireless communication Sep. 14, 2010
7735559 System and method to facilitate treatment and production in a wellbore Jun. 15, 2010
7647975 Gas lift valve assembly Jan. 19, 2010
7640990 Flow control valve for injection systems Jan. 5, 2010
7637326 Downhole safety valve apparatus and method Dec. 29, 2009
7604063 Flow valve and method Oct. 20, 2009
7591319 Gas activated actuator device for downhole tools Sep. 22, 2009
7533728 Ball operated back pressure valve May. 19, 2009
7520329 Injection valve Apr. 21, 2009
7510018 Convertible seal Mar. 31, 2009
7500523 Valve for controlling the flow of fluid between an interior region of the valve and an exterior region of the valve Mar. 10, 2009
7377327 Variable choke valve May. 27, 2008
7341108 Well downhole liquid dispenser Mar. 11, 2008
7240739 Well fluid control Jul. 10, 2007
7234529 Flow switchable check valve and method Jun. 26, 2007
7204313 Equalizing flapper for high slam rate applications Apr. 17, 2007
7191830 Annular pressure relief collar Mar. 20, 2007
7168492 Wellbore annulus flushing valve Jan. 30, 2007
7134488 Isolation assembly for coiled tubing Nov. 14, 2006
7108068 Floating plate back pressure valve assembly Sep. 19, 2006
7069997 Valve cage insert Jul. 4, 2006
7048079 Mud saver valve May. 23, 2006
7017671 Mud saver valve Mar. 28, 2006
6966366 Plunger enhanced chamber lift for well installations Nov. 22, 2005
6942039 Flapper valve and associated method for single trip retrieval of packer tools Sep. 13, 2005
6880639 Downhole injection system Apr. 19, 2005
6851480 Gas operated automatic, liquid pumping system for wells Feb. 8, 2005
6808023 Disconnect check valve mechanism for coiled tubing Oct. 26, 2004
6789626 Apparatus and method for cleaning debris from wells Sep. 14, 2004
6758273 Low-flow groundwater sampling system Jul. 6, 2004

1 2 3 4 5










 
 
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