Automatic shutoff valve

Details Automatic shutoff valve Automatic shutoff valve

1991-10-03

1993-08-31

Nilson, Robert G.

Fluid handling

Processes

137 781, 137312, 137551, 340605, 340636, G08B 2100, F16K 3102

Patent

active

052400220

ABSTRACT:
An automatic shutoff valve system for installation for instance in the water supply line to a hot water heater includes a sensor to detect leakage electrically by sensing moisture, and then shutting off the supply line in response. The valve mechanism includes a spring loaded ball valve normally latched in the open position which is unlatched and hence closes by the contraction of a BioMetal.TM. wire which activates a torsion spring to rotate the ball valve. The valve is controlled by a microprocessor which includes self test features, and the valve system may operate for a year or more on battery power.

REFERENCES:
patent: 4297686 (1981-10-01), Tom
patent: 4324268 (1982-04-01), Jacobson

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