Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Patent
1991-05-29
1992-10-06
Cohan, Alan
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
137480, 1374875, G05D 706
Patent
active
051523094
ABSTRACT:
The present invention provides a valve control apparatus which can be programmed to deliver a desired flow of gas. A valve 22 is connected to a stepper motor 28 which is controlled by a computer 32 to open or close the valve in steps within a gas flow line 24 to deliver a desired rate of flow. A flowmeter 30 is provided along the gas flow line 24 for measuring the flow and inputting this flow to the computer 32. The computer 32 calculates rate of flow information obtained from the flowmeter 30 and controls the stepper motor 28 to open or close the valve 22 as necessary in accordance with the received rate of flow information and a desired rate of flow preprogrammed into the computer 32. As a result, a precise desired rate of flow can be obtained. Also, position indicators 34 may be added to the valve 22 to indicate when the valve 22 is completely open or completely closed. The valve 22 may be provided with a return spring 36 to automatically close the valve 22 in the event of a power loss. The computer 32 may be programmed to detect a significant increase in the rate of gas flow being closing the valve 22 accordingly. Additionally, a pressure switch 38 may be provided along the gas flow line 24 to cause the valve 22 to close upon a pressure change. Finally, temperature 40 and pressure 42 sensors may be added along the gas flow line so that the computer 32 can calculate and maintain a specific mass flow of gas.
REFERENCES:
patent: 3776249 (1973-12-01), Wailes
patent: 4134423 (1979-01-01), Mayer
patent: 4690163 (1987-09-01), Steinemann
patent: 4813443 (1989-03-01), Pounder
patent: 4926903 (1990-05-01), Kawai
Bateman David E.
Twerdochlib Michael
Cohan Alan
Westinghouse Electric Corp.
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