Steam-metering method and apparatus
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United States of America Patent
Stats
-
Dec 31, 1985
Grant Date -
N/A
app pub date -
Nov 19, 1984
filing date -
Nov 19, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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