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Class Information
Number: 137/526
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Vacuum relief type
Description: Valves which open in response to an excessive decrease in pressure, e.g., to admit atmospheric air.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8667983 Relief valve for oil pump Mar. 11, 2014
8668183 Dual-direction in-tank magnetic safety valve Mar. 11, 2014
8573249 Relief valve for oil pump Nov. 5, 2013
8567434 Closing and sealing means for air admittance valves in sanitary waste water pipe systems Oct. 29, 2013
8555915 Dual action low head isolation valve Oct. 15, 2013
8448663 Vacuum relief valve May. 28, 2013
8360105 Air admittance vent Jan. 29, 2013
8347911 Vacuum relief valve and method for assembling the same Jan. 8, 2013
8297318 Check valve Oct. 30, 2012
8256453 Vacuum regulator having selectable adjustment ranges Sep. 4, 2012
8240331 Negative pressure relief valve assembly Aug. 14, 2012
8136548 Air admittance valve Mar. 20, 2012
8096587 Vacuum brake booster housing and non-rotatable connecting element Jan. 17, 2012
8087171 Method of installing axially adjustable driveshaft assembly Jan. 3, 2012
7971605 Air admittance vent diaphragm assembly Jul. 5, 2011
7886765 Living-hinge air vent valve Feb. 15, 2011
7578931 Pressure release protection device for automatic ground cleaning vehicles Aug. 25, 2009
7493913 Swimming pool vacuum relief safety valve Feb. 24, 2009
7455070 Swimming pool vacuum relief safety valve Nov. 25, 2008
7445022 Air admittance vent diaphragm assembly Nov. 4, 2008
7422030 Air admittance valve assembly Sep. 9, 2008
7410608 Methods for manufacturing a diaphragm for an air admittance valve Aug. 12, 2008
7395835 Air admittance valve Jul. 8, 2008
7383855 Sanitary tank vent valve Jun. 10, 2008
7275560 Pressure relief door for air duct work Oct. 2, 2007
7270146 Air vent valve Sep. 18, 2007
7140388 Dual ball valve air vent valve Nov. 28, 2006
7080657 Fuel tank venting system Jul. 25, 2006
7011103 Vacuum relief assembly for I.C. engine intakes Mar. 14, 2006
6959722 Device for adjusting the degree of vacuum in an apparatus for collecting substances by suction Nov. 1, 2005
6955664 Suction regulator and fluid drainage system Oct. 18, 2005
6866056 Fuel tank venting system Mar. 15, 2005
6799600 Protective metal housing for plastic air admittance valve Oct. 5, 2004
6789565 Metering valve Sep. 14, 2004
6687923 Vacuum release valve and method Feb. 10, 2004
6655402 System and method for vacuum flushing sewer solids Dec. 2, 2003
6554018 Water closet flushing system Apr. 29, 2003
6532988 Air admittance valve for sanitary waste pipe system Mar. 18, 2003
6415816 Air admittance valve assembly Jul. 9, 2002
6394128 Intake tract negative pressure relief valve for I.C. engine May. 28, 2002
6374854 Device for preventing permanent entrapment Apr. 23, 2002
6308731 Vent valve Oct. 30, 2001
6251285 Method for preventing an obstruction from being trapped by suction to an inlet of a pool filter pump system, and lint trap cover therefor Jun. 26, 2001
6234198 Air vent valve May. 22, 2001
6234197 Holding tank vacuum relief May. 22, 2001
6167910 Multi-layer microfluidic devices Jan. 2, 2001
6129116 Sealing devices Oct. 10, 2000
6070728 Filter bag with valve Jun. 6, 2000
6065493 Vacuum relief valve for sewage holding tank May. 23, 2000
6014986 Valve for a cooking utensil Jan. 18, 2000

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