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Class Information
Number: 137/516.25
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Plural seating
Description: Valves comprising a single flow path provided with a plurality of serially arranged sealing surfaces which cooperate with a single head element.










Sub-classes under this class:

Class Number Class Name Patents
137/516.27 Sequential 70


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8397748 Check valve having two seats Mar. 19, 2013
8365773 Valve device and testing method Feb. 5, 2013
8348182 Irrigation pipe Jan. 8, 2013
8276613 One-way valve of variable capacity compressor for vehicle Oct. 2, 2012
8240330 Squeeze film damper valve for compressor cylinders Aug. 14, 2012
8205640 Check valve, fluid device, and pump Jun. 26, 2012
7909055 Valve provided with a passage for conveying a medium and an installation provided with such a valve Mar. 22, 2011
7841359 Check valve Nov. 30, 2010
7814983 Dry pipe valve for fire protection sprinkler system Oct. 19, 2010
7644726 Self-cleaning flow shut off valve Jan. 12, 2010
7637323 Ball seat having fluid activated ball support Dec. 29, 2009
7600533 Microfluidic valve having free-floating member and method of fabrication Oct. 13, 2009
7481204 Internal combustion engine flow regulating valve Jan. 27, 2009
7464724 Valve assembly Dec. 16, 2008
7322423 Dry pipe valve for fire protection sprinkler system Jan. 29, 2008
7225830 Fluid control valve Jun. 5, 2007
7104333 Dry pipe valve for fire protection sprinkler system Sep. 12, 2006
6810963 Dry pipe valve for fire protection sprinkler system Nov. 2, 2004
6708716 Valve assembly Mar. 23, 2004
6557645 Dry pipe valve for fire protection sprinkler system May. 6, 2003
6394219 Hydraulic power steering system with a pressure relief valve May. 28, 2002
6289926 Flapper valve assembly with seat having load bearing shoulder Sep. 18, 2001
6263910 Valve with secondary load bearing surface Jul. 24, 2001
6196261 Flapper valve assembly with seat having load bearing shoulder Mar. 6, 2001
5988211 I.V. flow controller Nov. 23, 1999
5960823 Tank vacuum limiter assembly Oct. 5, 1999
5826612 Orifice scheduling ball check valve Oct. 27, 1998
5725013 Bush insert with orifice for a liquid-containing housing Mar. 10, 1998
5549135 Ball Valve Aug. 27, 1996
5529091 Check valve Jun. 25, 1996
5482077 High pressure abrasive slurry check valve Jan. 9, 1996
5406978 Shuttle orifice control mechanism Apr. 18, 1995
5336166 Three stage implantable valve Aug. 9, 1994
5332042 Fluid control valve Jul. 26, 1994
5318407 Check valve having internal float Jun. 7, 1994
5313974 Pipeline pressure release apparatus and method May. 24, 1994
5280131 Fluid-filled electric power cable system with two-way piston check valve Jan. 18, 1994
5207243 Two-way piston check valve May. 4, 1993
5189877 Exhaust manifold air injector Mar. 2, 1993
5119858 Valve Jun. 9, 1992
5052434 Valve, especially for compressors Oct. 1, 1991
4872475 Adjustable differential flow shuttle valve Oct. 10, 1989
4856548 Resuscitation valve Aug. 15, 1989
4825897 Flow control valve May. 2, 1989
4811756 Safety valve Mar. 14, 1989
4756982 Dual seal battery vent valve Jul. 12, 1988
4676266 Pressure relief device Jun. 30, 1987
4655251 Valve having hard and soft seats Apr. 7, 1987
4531543 Uni-directional flow, fluid valve Jul. 30, 1985
4518329 Wear resistant pump valve May. 21, 1985

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