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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:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 6715555 |
Subsea well production system |
Apr. 6, 2004 |
| 6684950 |
System for pressure testing tubing |
Feb. 3, 2004 |
| 6640824 |
Mud saver kelly valve |
Nov. 4, 2003 |
| 6629566 |
Method and apparatus for removing water from well-bore of gas wells to permit efficient production of gas |
Oct. 7, 2003 |
| 6622795 |
Flow actuated valve for use in a wellbore |
Sep. 23, 2003 |
| 6585048 |
Wellbore system having non-return valve |
Jul. 1, 2003 |
| 6571876 |
Fill up tool and mud saver for top drives |
Jun. 3, 2003 |
| 6536521 |
Multi-stage liquid elevator |
Mar. 25, 2003 |
| 6520256 |
Method and apparatus for cementing an air drilled well |
Feb. 18, 2003 |
| 6457520 |
Bottom hole assembly with coiled tubing insert |
Oct. 1, 2002 |
| 6427773 |
Flow through bypass tubing plug |
Aug. 6, 2002 |
| 6425413 |
Valve with secondary load bearing surface |
Jul. 30, 2002 |
| 6419023 |
Deviated borehole drilling assembly |
Jul. 16, 2002 |
| 6386289 |
Reclosable circulating valve for well completion systems |
May. 14, 2002 |
| 6354378 |
Method and apparatus for formation isolation in a well |
Mar. 12, 2002 |
| 6341652 |
Backflow prevention device |
Jan. 29, 2002 |
| 6289992 |
Variable pressure pump through nozzle |
Sep. 18, 2001 |
| 6289926 |
Flapper valve assembly with seat having load bearing shoulder |
Sep. 18, 2001 |
| 6283217 |
Axial equalizing valve |
Sep. 4, 2001 |
| 6199636 |
Open barrel cage |
Mar. 13, 2001 |
| 6196261 |
Flapper valve assembly with seat having load bearing shoulder |
Mar. 6, 2001 |
| 6186239 |
Casing annulus remediation system |
Feb. 13, 2001 |
| 6148920 |
Equalizing subsurface safety valve with injection system |
Nov. 21, 2000 |
| 6148915 |
Apparatus and methods for completing a subterranean well |
Nov. 21, 2000 |
| 6102060 |
Detachable locking device for a control valve and method |
Aug. 15, 2000 |
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