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Class Information
Number: 166/321
Name: Wells > Valves, closures or changeable restrictors > Fluid operated > Fluid pressure biased to open position position
Description: Devices in which fluid pressure acts on a surface of the valve to urge the valve to open position. The fluid acting on the valve may be the flow line fluid acting on surfaces of the valve of unequal areas or the fluid may be a control fluid distinct from the flow fluid.










Sub-classes under this class:

Class Number Class Name Patents
166/323 Locked open or closed 182
166/322 Retrievable 127
166/324 With fluid pressure equalizing means 195


Patents under this class:
1 2 3 4 5 6 7 8 9

Patent Number Title Of Patent Date Issued
8689884 Mud pulse telemetry system Apr. 8, 2014
8678110 Mud saver valve and method of operation of same Mar. 25, 2014
8678095 Gas assisted lift system Mar. 25, 2014
8662179 Remotely operated production valve and method Mar. 4, 2014
8646532 Valve, valving device and method Feb. 11, 2014
8640776 Fluid injection device Feb. 4, 2014
8596365 Resettable pressure cycle-operated production valve and method Dec. 3, 2013
8596368 Resettable pressure cycle-operated production valve and method Dec. 3, 2013
8590629 Flow stop valve and method Nov. 26, 2013
8579032 Casing annulus management Nov. 12, 2013
8573304 Eccentric safety valve Nov. 5, 2013
8539975 Drill string valve and method Sep. 24, 2013
8534369 Drill string flow control valve and methods of use Sep. 17, 2013
8534355 Gas valve and production tubing with a gas valve Sep. 17, 2013
8528649 Hydraulic pulse valve with improved pulse control Sep. 10, 2013
8469106 Downhole displacement based actuator Jun. 25, 2013
8453748 Subterranean well valve activated with differential pressure Jun. 4, 2013
8448659 Check valve assembly for well stimulation operations May. 28, 2013
8393403 Drill string flow control valves and methods Mar. 12, 2013
8387710 Downhole fluid recirculation valve and method for recirculating fluid in a well Mar. 5, 2013
8365832 Position retention mechanism for maintaining a counter mechanism in an activated position Feb. 5, 2013
8360154 Flow diverter ring for mud saver valves Jan. 29, 2013
8307902 Downhole flow control tool and method Nov. 13, 2012
8291981 Shear open valve Oct. 23, 2012
8276662 Systems and methods to filter and collect downhole fluid Oct. 2, 2012
8261817 Modular hydraulic operator for a subterranean tool Sep. 11, 2012
8251146 Frac sleeve system and method Aug. 28, 2012
8215402 Tubing pressure insensitive control system Jul. 10, 2012
8215403 Downhole circulating tool and method of use Jul. 10, 2012
8210266 Drill pipe Jul. 3, 2012
8201632 Downhole valve assembly and actuation device for a downhole valve assembly Jun. 19, 2012
8186440 Fluid injection device May. 29, 2012
8181705 Fluid injection device May. 22, 2012
8162060 Gas-lift valve and method of use Apr. 24, 2012
8157017 Method and apparatus for injecting fluid in a wellbore Apr. 17, 2012
8141642 Fill up and circulation tool and mudsaver valve Mar. 27, 2012
8118088 Shear activated safety valve system Feb. 21, 2012
8104540 Completion tool Jan. 31, 2012
8087463 Multi-position hydraulic actuator Jan. 3, 2012
8069926 Method of controlling flow through a drill string using a valve positioned therein Dec. 6, 2011
8066079 Drill string flow control valves and methods Nov. 29, 2011
8002039 Valve for controlling the flow of fluid between an interior region of the valve and an exterior region of the valve Aug. 23, 2011
7954550 Tubing pressure insensitive control system Jun. 7, 2011
7938189 Pressure protection for a control chamber of a well tool May. 10, 2011
7891432 Apparatus and methods for setting one or more packers in a well bore Feb. 22, 2011
7870908 Downhole valve having incrementally adjustable open positions and a quick close feature Jan. 18, 2011
7861788 Casing valves system for selective well stimulation and control Jan. 4, 2011
7861790 Injection valve and method Jan. 4, 2011
7836956 Positional control of downhole actuators Nov. 23, 2010
7814982 Downhole non-return valve and method Oct. 19, 2010

1 2 3 4 5 6 7 8 9










 
 
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