Fluid sensing shut-off devices with timer and methods of operation
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United States of America Patent
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Feb 9, 2010
Grant Date -
Jul 9, 2009
app pub date -
Mar 11, 2009
filing date -
Apr 19, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Fluid sensing shut-off devices with timer and methods of operation to shut off fluid flow if a primary shutoff valve sticks in the on condition. An embodiment is disclosed using a microphone to sense fluid flow, with a microprocessor periodically awakening from a sleep mode to power the sensor and determine if there is flow. If there is flow, the microprocessor times flow, and if flow is not shut off within a predetermined length of time, the microprocessor shuts off the valve. The valve itself normally held in a magnetically latched, valve open state, but may be unlatched by a current pulse to close the valve. Various embodiments and applications are disclosed.
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