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Class Information
Number: 137/511
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type)
Description: Valves which are responsive to pressure of the line fluid on the face of the valve disc or plug itself.










Sub-classes under this class:

Class Number Class Name Patents
137/517 Biased open 257
137/515 In couplings for coaxial conduits, e.g., drill pipe check valves 60
137/527 Pivoted valves 305
137/516.25 Plural seating 72
137/512 Plural 251
137/528 Reciprocating valves 101
137/843 Resilient material valve 187
137/516.11 Single head, plural ports in parallel 44
137/526 Vacuum relief type 140
137/524 With bias adjustment indicator 26
137/522 With external means for opposing bias 157
137/513.3 With leak passage 155
137/516 With means for selecting area of valve or seat 4
137/514 With retarder or dashpot 148


Patents under this class:
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Patent Number Title Of Patent Date Issued
8622081 Fluid flow control valve Jan. 7, 2014
8607746 Cooling system expansion tank Dec. 17, 2013
8596560 Check valve Dec. 3, 2013
8591634 Method and equipment for selectively collecting process effluent Nov. 26, 2013
8592063 Battery pack pressure valve Nov. 26, 2013
8581151 Steam oven water delivery and drain valve systems and methods Nov. 12, 2013
8544493 Water hammer proof and silent check valve Oct. 1, 2013
8528591 Micro valve, method for producing a micro valve, as well as micro pump Sep. 10, 2013
8517703 Compressor including valve assembly Aug. 27, 2013
8512482 Device for blocking fluid passage through a tubular part by means of a check valve, particularly in a household appliance Aug. 20, 2013
8496738 Nitrogen and oxygen separation using vacuum swing adsorption Jul. 30, 2013
8444401 Check valve and piston pump having check valve May. 21, 2013
8408244 Sanitary installation part Apr. 2, 2013
8373539 Gas cutoff apparatus Feb. 12, 2013
8333852 Method for conditioning process gases for the heat treatment of metallic work pieces in industrial furnaces Dec. 18, 2012
8323573 Microfluidic cartridge with solution reservoir-pump chamber Dec. 4, 2012
8316900 Fluid receiver having removable sleeve Nov. 27, 2012
8309039 Valve structure for consistent valve operation of a miniaturized fluid delivery and analysis system Nov. 13, 2012
8282789 Microwave apparatus and method of extracting essential oils, essence, and pigments with gas flow Oct. 9, 2012
8282788 Extraction apparatus and method of extracting essential oils, essence, and pigments from odorous raw material by microwave heating under sub-critical conditions Oct. 9, 2012
8205765 Gas absorption reservoir with optimized cooling Jun. 26, 2012
8029939 Fuel cell ejector with integrated check valve Oct. 4, 2011
7997276 Respiration pillow Aug. 16, 2011
7950361 Valve timing control apparatus May. 31, 2011
7828146 Inflatable containers Nov. 9, 2010
7491321 Oxidation tank control valve assembly and systems and methods for replenishing a charge of oxygen-containing gas within an oxidation tank Feb. 17, 2009
7461515 Sequential hot gas defrost method and apparatus Dec. 9, 2008
7406954 Fuel pump check valve Aug. 5, 2008
7334603 Check valve Feb. 26, 2008
7104472 Constant velocity turbine and stator assemblies Sep. 12, 2006
7040320 Valve device for controlled supply of a pressure fluid May. 9, 2006
6955755 Liquid filter comprising a valve arranged in a support tube of a filter element Oct. 18, 2005
6921030 Constant velocity turbine and stator assemblies Jul. 26, 2005
6779554 Return check valve Aug. 24, 2004
6742995 Air compressor assembly Jun. 1, 2004
6481464 Check valve Nov. 19, 2002
6264290 Single-operation valve assembly for braking systems and the like Jul. 24, 2001
6129714 Medical drainage means Oct. 10, 2000
6039074 Pressure-induced shut-off valve for a liquid delivery system Mar. 21, 2000
5837204 System for disinfecting the water lines of a dental unit Nov. 17, 1998
5819793 Breather valve Oct. 13, 1998
5693219 Apparatus for backwashing a water filter Dec. 2, 1997
5669410 Air flow rate regulation apparatus for air pump Sep. 23, 1997
5623974 Spray product and pump to supply air under pressure to the dispenser Apr. 29, 1997
5558121 Fluid actuated ball check valve assembly Sep. 24, 1996
5501242 Pressure relief valve Mar. 26, 1996
4929229 Breastpump having improved valve mechanism May. 29, 1990
4528999 Pressure relief device for pipes Jul. 16, 1985
4401224 Feeding bottle for infants Aug. 30, 1983
4271862 Check valve and method of manufacturing said check valve Jun. 9, 1981

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