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Class Information
Number: 137/396
Name: Fluid handling > Liquid level responsive or maintaining systems > Control of outflow from tank > Self-emptying tanks
Description: Apparatus in which a means sensing a predetermined, usually high, liquid level or a full condition of a tank which is accumulating liquid controls the opening of the tank outlet, allowing the liquid to discharge, and the closing of the outlet at a low level or when the tank is empty, the cycle being repeated as long as liquid is supplied to the tank.










Sub-classes under this class:

Class Number Class Name Patents
137/397 By float 37


Patents under this class:

Patent Number Title Of Patent Date Issued
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8157132 Fuel and oil mixing device Apr. 17, 2012
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7597116 Marine greywater disposal system Oct. 6, 2009
7207318 Method for operation of a device for energy conversion using a main fuel and at least one auxiliary fuel Apr. 24, 2007
7055543 Solenoid actuated control for fuel distribution in a dual fuel tank vehicle Jun. 6, 2006
6792966 Fuel transfer pump and control Sep. 21, 2004
6782908 Automotive washer system utilizing a freezable washer liquid and a freeze-resistant washer liquid Aug. 31, 2004
6684902 Dual sensor liquid accumulator Feb. 3, 2004
6675795 Freeze resistant method for draining furnace condensate in low temperature environments Jan. 13, 2004
6554021 Apparatus for shock-like flushing in a liquid system Apr. 29, 2003
6494226 Fuel transfer pump and control Dec. 17, 2002
6467497 Buffer box for use in a vacuum drainage system Oct. 22, 2002
6449781 Apparatus for flushing in a liquid system Sep. 17, 2002
6279593 Electric steam trap system and method of draining condensate Aug. 28, 2001
6269831 Precision volumetric measuring and mixing apparatus Aug. 7, 2001
5954078 Method and apparatus for handling liquid chemical waste Sep. 21, 1999
5887613 Device for the regulation of a constant outflow from a liquid container Mar. 30, 1999
5871027 Vacuum valve controller Feb. 16, 1999
5657784 Control arrangement for actuating a shut-off valve and method of operation Aug. 19, 1997
5615701 Vacuum valve control device and vacuum valve Apr. 1, 1997
5588458 Vacuum valve controller for vacuum sewer system Dec. 31, 1996
5531241 Condensate trap and drain for systems under pressure Jul. 2, 1996
5449016 Sewage system Sep. 12, 1995
5429149 Valve assembly Jul. 4, 1995
5419359 Gas and liquid backflow-preventing valve device for drains May. 30, 1995
5375739 Apparatus for control of delivery of liquids Dec. 27, 1994
5259427 Package system for collection-transport of waste liquids Nov. 9, 1993
5207251 Liquid level sensing method and apparatus May. 4, 1993
5069243 Liquid level control system Dec. 3, 1991
5048558 Valve seat and method of repair Sep. 17, 1991
4870986 Dispensing system Oct. 3, 1989
4345618 Arrangement for the regulation of the height of a liquid level Aug. 24, 1982
4321948 Discharge system for septic tank Mar. 30, 1982
4285359 Interface unit for vacuum sewers Aug. 25, 1981
4257437 Liquid flow control Mar. 24, 1981
4202367 Circuit arrangement for regulating the level of liquid in vessels May. 13, 1980
3998736 Sewage disposal system Dec. 21, 1976











 
 
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