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Class Information
Number: 137/218
Name: Fluid handling > Back flow prevention by vacuum breaking (e.g., anti-siphon devices) > Air vent in liquid flow line > Valved > With co-acting valve in liquid flow path
Description: Apparatus wherein a valve is provided in the liquid flow path which operates in conjunction with the air vent valve.










Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8613290 Anti-inundation and drainage structure for a anti-freeze faucet Dec. 24, 2013
8578959 Rinse valve for vacuum waste system Nov. 12, 2013
8336569 Mixing eductor Dec. 25, 2012
8286662 Switching valve with slider Oct. 16, 2012
8272394 Double check back flow prevention device Sep. 25, 2012
8240333 Separator for a release valve Aug. 14, 2012
8215332 Zone indicator and vacuum breaker combination Jul. 10, 2012
8127787 Siphon breaker Mar. 6, 2012
8042565 Double check back flow prevention device Oct. 25, 2011
7954507 Mixing eductor Jun. 7, 2011
7921868 Airing and venting elements for pipes and fittings Apr. 12, 2011
7896024 Backpressure relief valve Mar. 1, 2011
7828005 Freezeless hydrant Nov. 9, 2010
7681584 Pipe disconnector Mar. 23, 2010
7575016 Pipe disconnector with increased sealing power Aug. 18, 2009
7543599 Siphon and backflow resistant valve Jun. 9, 2009
7497228 Freeze and backflow protection for a subterranean water flushing system Mar. 3, 2009
7458388 Freeze safe valve Dec. 2, 2008
7409964 Faucet type valve with backflow control in handle structure Aug. 12, 2008
7293576 Single-piece manifold with reduced pressure arrangement Nov. 13, 2007
7191962 Sprayer apparatus with backflow valve Mar. 20, 2007
7100637 Wall hydrant having backflow preventor Sep. 5, 2006
7093608 Vacuum pressure breaker and freeze protection for a water flushing system Aug. 22, 2006
7059340 Valve assembly for pipe disconnectors Jun. 13, 2006
7013910 Back flow preventer made of at least two different types of material Mar. 21, 2006
7004187 Line pressure diverter apparatus Feb. 28, 2006
6935358 Flow controlling hydrant structure Aug. 30, 2005
6923426 Relief valve for use in a diaphragm flush valve Aug. 2, 2005
6913033 Diverter valve with removable cartridge including integral atmospheric type vacuum breaker and check Jul. 5, 2005
6913032 Sanitary faucet unit Jul. 5, 2005
6910495 Backflow prevention system Jun. 28, 2005
6904931 Vacuum breaker with water leak containment device Jun. 14, 2005
6899120 Yard hydrant May. 31, 2005
6857446 Flow controlling dual hydrant Feb. 22, 2005
6805154 Freeze protection device for wall hydrants/faucets Oct. 19, 2004
6792962 Enhanced backflow prevention apparatus and method Sep. 21, 2004
6779549 In-line vacuum breaker Aug. 24, 2004
6776183 Aircraft drain device Aug. 17, 2004
6769450 Valve system Aug. 3, 2004
6761183 Back flow preventing adjustable valve apparatus with fluid escape Jul. 13, 2004
6757920 Hand spray mounts with integral backflow prevention Jul. 6, 2004
6755209 Fill valve assembly for a flush tank Jun. 29, 2004
6752167 Freeze resistant automatic draining wall hydrant with dual check vacuum breaker Jun. 22, 2004
6672096 Vacuum-breaking valve for refrigeration appliances Jan. 6, 2004
6648003 Backflow preventer Nov. 18, 2003
6611971 Hand spray mounts with integral backflow prevention Sep. 2, 2003
6609854 Structure and method for detecting an inflated state of a flexible membrane dam Aug. 26, 2003
6554018 Water closet flushing system Apr. 29, 2003
6539973 Water pressure-assisted flush valve Apr. 1, 2003
6532986 Freeze protection device for wall hydrants/faucets Mar. 18, 2003

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