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Class Information
Number: 137/409
Name: Fluid handling > Liquid level responsive or maintaining systems > By float controlled valve
Description: Apparatus wherein the element which senses the liquid level floats on the liquid and is buoyed up thereby.










Sub-classes under this class:

Class Number Class Name Patents
137/434 Float arm operated valve 105
137/428 In separate communicating float chamber 68
137/426 Level adjustment or selection means 170
137/423 Plural floats 89
137/416 Quick acting 23
137/429 Rectilinearly traveling float 81
137/412 Servo relay operation of control 51
137/411 Single float controls plural valves 23
137/410 Valve opened by external means, closing or closing control by float 68
137/424 With counter-balance 5
137/427 With float leakage disposal 6


Patents under this class:

Patent Number Title Of Patent Date Issued
8656943 Liquid appliance and transport lock Feb. 25, 2014
8636026 Backflow preventing apparatus for water closets Jan. 28, 2014
8632736 Float and tube system for separating a suspension with an internal trap Jan. 21, 2014
8578961 Low profile backwater valve Nov. 12, 2013
8561842 Valve apparatus for selectively dispensing liquid from a plurality of sources Oct. 22, 2013
8434646 Mixed beverage dispense system and method May. 7, 2013
8316695 Line leak detector and method of using same Nov. 27, 2012
8291929 Dual float rollover valve Oct. 23, 2012
8177090 Storage tank with floating roof emergency draining system and spherical rotor fume sealing valve May. 15, 2012
7997297 System and method for performing a chemical experiment Aug. 16, 2011
7870868 Water conservation kit Jan. 18, 2011
7604017 Water ingress detection system Oct. 20, 2009
7537020 Vacuum breaking device May. 26, 2009
7516753 Toilet tank plumbing fixture assembly Apr. 14, 2009
7392820 Liquid shut-off valve Jul. 1, 2008
7293577 Toilet tank plumbing fixture assembly Nov. 13, 2007
7243669 Float-responsive valve with premature closure prevention Jul. 17, 2007
7216664 Device for blocking the water outlet of a light liquid separator May. 15, 2007
7047999 Humidification chamber with float-valve having improved float May. 23, 2006
6913047 Drop tube assemblies adapted for use with a liquid reservoir Jul. 5, 2005
6845782 Multiple tank circulating fuel system Jan. 25, 2005
6670585 Humidity cabinet with automatic fluid fill system Dec. 30, 2003
6499503 Backflow valve Dec. 31, 2002
6497143 Container with automatically controlled discharge for continuous metering of liquid flow Dec. 24, 2002
6446665 Backwater valve Sep. 10, 2002
6415813 Shut-off valve for a tank Jul. 9, 2002
6318404 Backflow valve Nov. 20, 2001
6148852 Sump pit regulating valve Nov. 21, 2000
6021807 Water refilling control mechanism for a water tank Feb. 8, 2000
5950692 Arrangement for limiting the fill level of a fuel tank Sep. 14, 1999
5941417 Fill system equipped with apparatus for continuous controlled inflow to a balance tank Aug. 24, 1999
5814213 Skimming apparatus Sep. 29, 1998
5421110 Electric iron with reservoir fill-check float valve Jun. 6, 1995
5406972 Backwater valve Apr. 18, 1995
5398735 Filling regulator for liquid storage tank Mar. 21, 1995
5388622 Automatic shutoff valve Feb. 14, 1995
5121770 Hydraulically controlled valve for a cool tower and the like Jun. 16, 1992
5027870 Overfill prevention mechanism for storage tanks Jul. 2, 1991
4868933 Flush control devices Sep. 26, 1989
4689472 Control device for corrosion testing apparatus Aug. 25, 1987
4627460 Condensate discharge device for combustion apparatus Dec. 9, 1986
4568369 Method and apparatus for rapidly altering the temperature of fluid in a closed vessel Feb. 4, 1986
4461735 Humidifier with water overflow relief mechanism Jul. 24, 1984
4318421 Float controlled syphon valve for swimming pool cover Mar. 9, 1982
4187262 Carbonator and liquid level control Feb. 5, 1980
4019454 Boat plug apparatus Apr. 26, 1977
3985626 Arrangement for regulating the distillate height level in the degassing stage of an evaporation installation Oct. 12, 1976
3974654 Self-regulating tide gate Aug. 17, 1976











 
 
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