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Class Information
Number: 137/393
Name: Fluid handling > Liquid level responsive or maintaining systems > With control fluid connection at desired liquid level
Description: Apparatus wherein the level to be controlled is in a pressure tank, as a boiler, and a separate control chamber is provided to control a liquid inflow or outflow line of the tank. The control chamber is provided with a connection to the tank at the desired liquid level so that when the liquid is above this level the chamber is filled with liquid by the tank pressure and when the liquid is below the desired level the liquid in the control chamber is drained to the pressure tank. The presence or absence of liquid in the control chamber causes the control of the liquid inflow or outflow line of the tank.

Patents under this class:
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Patent Number Title Of Patent Date Issued
7757709 Integrated jet fluid level shutoff sensor and fuel tank vent for vehicles Jul. 20, 2010
7641771 Pressure desalination Jan. 5, 2010
7258130 Integrated jet fluid level shutoff sensor and fuel tank vent for vehicles Aug. 21, 2007
7189365 Liquid treating equipment including a storage vessel and a discharge vessel Mar. 13, 2007
7156133 Liquid replenishment system Jan. 2, 2007
7146729 Fuel vapor vent valve and method of attaching same to a tank Dec. 12, 2006
7059367 Liquid level maintaining device Jun. 13, 2006
7055546 Fluid intake pressure regulating system Jun. 6, 2006
7028700 Method and apparatus for level control in a water tank of a fuel reformer Apr. 18, 2006
6997201 Wastewater source control system Feb. 14, 2006
6969460 Graywater diverter vessel assembly Nov. 29, 2005
6848483 Liquid level maintaining device Feb. 1, 2005
6837262 Non tank pressurizing fast fill receiver and system for vehicles Jan. 4, 2005
6837263 Liquid level control system Jan. 4, 2005
6684902 Dual sensor liquid accumulator Feb. 3, 2004
6582563 Water purification system Jun. 24, 2003
6467497 Buffer box for use in a vacuum drainage system Oct. 22, 2002
6164332 In-line magnetic water manufacturing apparatus Dec. 26, 2000
6082392 Dual hose assembly and control system for truck-to-truck fuel transfer Jul. 4, 2000
6045336 Pump and valve for leachate extraction of heavier than water fluids Apr. 4, 2000
6021806 Slurry distribution system for a CMP process in semiconductor device fabrication Feb. 8, 2000
6000425 Automatic remote fluid level controller Dec. 14, 1999
5969619 Liquid level control system Oct. 19, 1999
5900141 Water purifier having accumulating means arranged to prevent backward water flow May. 4, 1999
5881753 Passive fluid level controller Mar. 16, 1999
5871027 Vacuum valve controller Feb. 16, 1999
5718261 Cleaning solution dispenser for use in a water tank, and water tank capable of discharging mixture of water and cleaning solution Feb. 17, 1998
5673736 Temperature-compensated automatic stop fill for filling of tanks with liquids under vapor or gas pressure Oct. 7, 1997
5662460 Downhole pneumatic pump with variable bouyant actuator Sep. 2, 1997
5661855 Reservoir fill valve control for toilet storage tanks Sep. 2, 1997
5649577 Method and apparatus for automatically stopping the process of filling of a tank with a liquid under gas or vapor pressure Jul. 22, 1997
5641271 Float operated pump including diaphragm valve assembly with bleed passage Jun. 24, 1997
5630443 Buoyant body control device May. 20, 1997
5615701 Vacuum valve control device and vacuum valve Apr. 1, 1997
5588471 Container filling apparatus Dec. 31, 1996
5564464 Storage tank shut-off valve Oct. 15, 1996
5519638 Automatic system for monitoring and replenishing hazardous liquids in tanks May. 21, 1996
5414641 Method and apparatus for determining elementary circuits and initial values of flows in a pipe network May. 9, 1995
5285812 Jet level sensor for fuel tanks Feb. 15, 1994
5275216 Liquid overflow shut-off valve Jan. 4, 1994
5243973 Metering device for a liquid anesthetic via an intermediate container Sep. 14, 1993
5154205 Method and apparatus for maintaining level of water in above-ground swimming pools Oct. 13, 1992
5090442 Field repairable apparatus for use in filling containers to a predetermined level Feb. 25, 1992
5069243 Liquid level control system Dec. 3, 1991
5053111 Method and apparatus for the batch distillation of water Oct. 1, 1991
5048557 Main valve and seat for use in filling containers to a predetermined level Sep. 17, 1991
4957147 Container filling apparatus Sep. 18, 1990
4893364 Water-recycling shower Jan. 16, 1990
4887635 Fluid fill valve with accurate fill level mechanism Dec. 19, 1989
4793440 Liquid lubricant sump level management system Dec. 27, 1988

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