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Class Information
Number: 137/251.1
Name: Fluid handling > With liquid valves or liquid trap seals > Liquid valves
Description: Apparatus in which the sealing liquid alone performs a valving function in response to either external control means or to fluid pressure in the flow path, i.e., no flow conduit is withdrawn from the liquid to open a flow path.

Sub-classes under this class:

Class Number Class Name Patents
137/252 Branched passage for sealing liquid 6
137/253 With auxiliary means for varying liquid level 17
137/254 With baffle 12

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8701553 Valve system Apr. 22, 2014
8607813 Method for reducing the air feed from the atmosphere into the expansion vessel of high-voltage systems filled with insulating liquid and device for carrying out the method Dec. 17, 2013
8578963 Nonreturn valve for an exhaust line Nov. 12, 2013
8490655 Valve unit, microfluidic device having the same, and method of driving the valve unit Jul. 23, 2013
8333213 Valve system Dec. 18, 2012
8202080 Stackable valve system Jun. 19, 2012
8181666 Switch valve May. 22, 2012
8156957 System for accurately weighing solids and control mechanism for same Apr. 17, 2012
7967599 Ring shaped valve piston and its use in a blow moulding machine Jun. 28, 2011
7921646 Fluidic valve water drain Apr. 12, 2011
7874305 Microvalve having magnetic wax plug and flux control method using magnetic wax Jan. 25, 2011
7866954 Valve and micro fluid pump having the same Jan. 11, 2011
7841190 Freeze-thaw valve that self-limits cryogenic agent usage Nov. 30, 2010
7837948 Phase transition type valve and method of manufacturing the same Nov. 23, 2010
7661436 Liquid seal for recovering flared gas Feb. 16, 2010
7478792 Microvalve having magnetic wax plug and flux control method using magnetic wax Jan. 20, 2009
7329535 Apparatus for circulating carrier fluid Feb. 12, 2008
7204264 High pressure capillary micro-fluidic valve device and a method of fabricating same Apr. 17, 2007
7195036 Thermal micro-valves for micro-integrated devices Mar. 27, 2007
7077154 Apparatus for controlling the pressure of gas by bubbling through a liquid, such as bubble CPAP Jul. 18, 2006
6973938 Liquid column pressure and vacuum vent Dec. 13, 2005
6823895 Magnetorheological fluid device Nov. 30, 2004
6718789 Pipe freezer with defrost cycle Apr. 13, 2004
6653245 Method for liquid phase deposition Nov. 25, 2003
6575188 Methods and systems for fluid control in microfluidic devices Jun. 10, 2003
6568415 Storing device for easily polymerizable and coagulating liquid substance and method for pressure control thereof May. 27, 2003
6557575 Fluid flow control freeze/thaw valve for narrow bore capillaries or microfluidic devices May. 6, 2003
6495374 Fluid sampling device comprising a thermal control valve Dec. 17, 2002
6450203 Sealed microfluidic devices Sep. 17, 2002
6415821 Magnetically actuated fluid handling devices for microfluidic applications Jul. 9, 2002
6408884 Magnetically actuated fluid handling devices for microfluidic applications Jun. 25, 2002
6321766 Electromagnetic flow control valve for a liquid metal with built-in flow measurement Nov. 27, 2001
6302134 Device and method for using centripetal acceleration to device fluid movement on a microfluidics system Oct. 16, 2001
6199577 Pressure relief system for chemical storage tanks Mar. 13, 2001
6186176 System and method for controlling the flow of a gaseous medium through a fluid Feb. 13, 2001
6049031 Magnetic valve system for a musical instrument Apr. 11, 2000
6044858 Electromagnetic flow control valve for a liquid metal Apr. 4, 2000
6044866 Gas flow valve Apr. 4, 2000
5988197 Freeze valve and treatment enclosure controlled by at least one such valve Nov. 23, 1999
5752539 Two flow control means using partially solidified plug May. 19, 1998
5632305 Apparatus for securing a pressure vessel against over pressure May. 27, 1997
5548965 Multi-cavity evaporator Aug. 27, 1996
5502965 Device for generating operating states characterized by differences in height in mechanical actuators Apr. 2, 1996
5483986 Method of displacing liquids through pipes Jan. 16, 1996
5362027 Flow regulating valve for magnetic particles Nov. 8, 1994
5363130 Method of valving and orientation sensitive valve including a liquid for controlling flow of gas into a container Nov. 8, 1994
5341160 Valve for ink-jet pen Aug. 23, 1994
5241991 Electro-rheological control valve Sep. 7, 1993
5070899 Check valve Dec. 10, 1991
4966015 Apparatus for the production of small clear ice bodies Oct. 30, 1990

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