Fluid handling – Liquid level responsive or maintaining systems – By float controlled valve
Reexamination Certificate
2005-01-04
2005-01-04
Walton, George L. (Department: 2856)
Fluid handling
Liquid level responsive or maintaining systems
By float controlled valve
C073S299000, C092S1030SD, C137S386000, C137S393000, C137S893000, C137S895000, C141S198000, C251S061100, C251S061200
Reexamination Certificate
active
06837263
ABSTRACT:
A liquid level control system including a tank; a source of liquid in communication with the tank; a pressure fluid actuated valve for controlling the flow of liquid to the tank from the source; a pressure sensor disposed in the tank to monitor the hydrostatic pressure determined by the quantity of liquid in the tank. A source of pressure fluid is provided which is normally vented to the atmosphere. A pressure fluid amplifier is coupled to the pressure fluid actuated valve and to the source of pressure fluid. When the pressure sensor sensed an increase of pressure caused by an increase in the liquid level in the tank, the pressure fluid amplifier is effective to actuate the valve to close and militate against flowing into the tank to maintain the liquid at a predetermined level.
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DistaView Corporation
Fraser Donald R.
Fraser Martin Buchanan Miller LLC
Walton George L.
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