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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:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7624792 |
Shear activated safety valve system |
Dec. 1, 2009 |
| 7617874 |
Flexible matrix composite actuator for use in subsurface wellbores |
Nov. 17, 2009 |
| 7614452 |
Flow reversing apparatus and methods of use |
Nov. 10, 2009 |
| 7591317 |
Tubing pressure insensitive control system |
Sep. 22, 2009 |
| 7591319 |
Gas activated actuator device for downhole tools |
Sep. 22, 2009 |
| 7584801 |
Drill string flow control valves and methods |
Sep. 8, 2009 |
| 7562713 |
Downhole actuation tools |
Jul. 21, 2009 |
| 7552774 |
Control line hydrostatic minimally sensitive control system |
Jun. 30, 2009 |
| 7537056 |
System and method for gas shut off in a subterranean well |
May. 26, 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 |
| 7455116 |
Injection valve and method |
Nov. 25, 2008 |
| 7451828 |
Downhole pressure containment system |
Nov. 18, 2008 |
| 7441607 |
Circulation tool |
Oct. 28, 2008 |
| 7438130 |
Downhole actuating apparatus and method |
Oct. 21, 2008 |
| 7398830 |
Electric-hydraulic power unit |
Jul. 15, 2008 |
| 7347270 |
Redundant hydraulic system for safety valve |
Mar. 25, 2008 |
| 7341108 |
Well downhole liquid dispenser |
Mar. 11, 2008 |
| 7331396 |
Subsea production systems |
Feb. 19, 2008 |
| 7331398 |
Multi-drop flow control valve system |
Feb. 19, 2008 |
| 7287595 |
Electric-hydraulic power unit |
Oct. 30, 2007 |
| 7267177 |
Tubing fill and testing valve |
Sep. 11, 2007 |
| 7216713 |
Downhole actuating apparatus and method |
May. 15, 2007 |
| 7139219 |
Hydraulic impulse generator and frequency sweep mechanism for borehole applications |
Nov. 21, 2006 |
| 7134488 |
Isolation assembly for coiled tubing |
Nov. 14, 2006 |
| 7086471 |
Method and apparatus for controlling downhole flow |
Aug. 8, 2006 |
| 7073590 |
Dual energized hydroseal |
Jul. 11, 2006 |
| 7063156 |
Tubing fill and testing valve |
Jun. 20, 2006 |
| 7059426 |
Acoustic flow pulsing apparatus and method for drill string |
Jun. 13, 2006 |
| 7032672 |
Subsurface safety valve having a communication tool accessible non annular hydraulic chamber |
Apr. 25, 2006 |
| 7017671 |
Mud saver valve |
Mar. 28, 2006 |
| 6997263 |
Multi zone isolation tool having fluid loss prevention capability and method for use of same |
Feb. 14, 2006 |
| 6976542 |
Mud flow back valve |
Dec. 20, 2005 |
| 6957703 |
Closure mechanism with integrated actuator for subsurface valves |
Oct. 25, 2005 |
| 6904975 |
Interventionless bi-directional barrier |
Jun. 14, 2005 |
| 6899179 |
Bypass valve |
May. 31, 2005 |
| 6892816 |
Method and apparatus for selective injection or flow control with through-tubing operation capacity |
May. 17, 2005 |
| 6880639 |
Downhole injection system |
Apr. 19, 2005 |
| 6866095 |
Downhole safety valve for central circulation completion system |
Mar. 15, 2005 |
| 6851477 |
Curved flapper with angle variant seat for a subsurface safety valve |
Feb. 8, 2005 |
| 6834722 |
Cyclic check valve for coiled tubing |
Dec. 28, 2004 |
| 6834889 |
Torque release coupling for use in drill strings |
Dec. 28, 2004 |
| 6732804 |
Dynamic mudcap drilling and well control system |
May. 11, 2004 |
| 6702024 |
Dual energized hydroseal |
Mar. 9, 2004 |
| 6691785 |
Isolation valve |
Feb. 17, 2004 |
| 6684950 |
System for pressure testing tubing |
Feb. 3, 2004 |
| 6684958 |
Flapper lock open apparatus |
Feb. 3, 2004 |
| 6675897 |
Downhole bypass valve |
Jan. 13, 2004 |
| 6675891 |
Apparatus and method for gravel packing a horizontal open hole production interval |
Jan. 13, 2004 |
| 6668935 |
Valve for use in wells |
Dec. 30, 2003 |
| 6668933 |
Ball valve seat and support |
Dec. 30, 2003 |
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