Fluid sensing shut-off devices with timer and methods of...

Details Fluid sensing shut-off devices with timer and methods of... Fluid sensing shut-off devices with timer and methods of...

2009-03-11

2010-02-09

Hepperle, Stephen (Department: 3753)

Fluid handling

Line condition change responsive valves

Safety cut-off requiring reset

C251S065000, C251S129030, C137S487500

Reexamination Certificate

active

07658203

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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