Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Patent
1984-11-19
1985-12-31
Cohan, Alan
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
137110, G05D 706
Patent
active
045614580
ABSTRACT:
A steam or the like supply system has two parallel legs of supply, a first leg designed for high-demand flows and for the metering thereof, and a second leg designed for low-demand flows and for the metering thereof. Each of these legs has its own control valve, and an electronic controller responds to a sensed drop in demand to control a program of valve in the low-demand line; similarly, the controller responds to a sensed increase in demand to control a program of valve shut down in the low-demand leg while opening the control valve in the high-demand line. Protective features in the controller assure against response to transient changes in demand and against interruption of a valve-changing operation until the programmed change has been fully implemented.
REFERENCES:
patent: 1503591 (1924-08-01), Kerr
patent: 2949125 (1960-08-01), Gilmore
patent: 3169047 (1965-02-01), Osburn
Cohan Alan
Spence Engineering Company
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