Liquid level control system
First Claim
1. A liquid level control system comprising:
- a tank;
a source of liquid in communication with said tank;
a pressure fluid actuated valve for controlling the flow of liquid to said tank from said source;
a hydrostatic pressure sensor disposed in said tank, said pressure sensor including a conduit having one end submersed in the liquid in said tank;
a source of pressure fluid; and
a pressure fluid amplifier having separate connections for each of a pressure fluid outlet coupled to the pressure fluid actuated valve for controlling the flow of liquid from said source of liquid, a first inlet coupled to said source of pressure fluid, and a second inlet in communication with an other end of the conduit of said sensor, said amplifier including a proportional sensor for providing selective communication between the source of pressure fluid and said pressure fluid actuated valve, the proportional sensor directly responsive to proportional changes in pressure within said amplifier due to one of a flow of pressure fluid in said amplifier and a level of liquid in said tank, wherein a predetermined level of liquid attained in said tank is determined by a flexibility of the proportional sensor.
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Accused Products
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.
39 Citations
20 Claims
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1. A liquid level control system comprising:
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a tank;
a source of liquid in communication with said tank;
a pressure fluid actuated valve for controlling the flow of liquid to said tank from said source;
a hydrostatic pressure sensor disposed in said tank, said pressure sensor including a conduit having one end submersed in the liquid in said tank;
a source of pressure fluid; and
a pressure fluid amplifier having separate connections for each of a pressure fluid outlet coupled to the pressure fluid actuated valve for controlling the flow of liquid from said source of liquid, a first inlet coupled to said source of pressure fluid, and a second inlet in communication with an other end of the conduit of said sensor, said amplifier including a proportional sensor for providing selective communication between the source of pressure fluid and said pressure fluid actuated valve, the proportional sensor directly responsive to proportional changes in pressure within said amplifier due to one of a flow of pressure fluid in said amplifier and a level of liquid in said tank, wherein a predetermined level of liquid attained in said tank is determined by a flexibility of the proportional sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A liquid level control system comprising:
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a tank;
a source of liquid in communication with said tank;
a pressure fluid actuated valve for controlling the flow of liquid to said tank from said source;
a hydrostatic pressure sensor disposed in said tank, said pressure sensor including a conduit having one end submersed in the liquid in said tank;
a source of pressure fluid; and
a pressure fluid amplifier having a pressure fluid outlet coupled to the pressure fluid actuated valve for controlling the flow of liquid from said source of liquid, a first inlet coupled to said source of pressure fluid, a second inlet in communication with an other end of the conduit of said sensor, a vent, and a proportional sensor for providing selective communication between the source of pressure fluid and the vent to cause an actuation of said valve, wherein proportional changes in a level of liquid in said tank and flow of pressure fluid in said amplifier adjacent the proportional sensor causes proportional flexing of the proportional sensor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A liquid level control system comprising:
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a tank;
a source of liquid in communication with said tank;
a pressure fluid actuated valve for controlling the flow of liquid to said tank from said source;
a hydrostatic pressure sensor disposed in said tank, said pressure sensor including a conduit having one end submersed in the liquid in said tank;
a source of pressure fluid; and
a pressure fluid amplifier having a pressure fluid outlet coupled to the pressure fluid actuated valve for controlling the flow of liquid from said source of liquid, a first inlet coupled to said source of pressure fluid, a second inlet in communication with an other end of the conduit of said sensor, and a proportional sensor for providing selective actuation of said valve, wherein the pressure fluid outlet and the first inlet of said amplifier communicate with a surface of the proportional sensor of said amplifier, and the second inlet of said amplifier communicates with an opposite surface of the proportional sensor of said amplifier, wherein proportional changes in a level of liquid in said tank and flow of pressure fluid in said amplifier adjacent the proportional sensor cause proportional flexing of the proportional sensor. - View Dependent Claims (20)
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Specification