| 摘要 |
<p>AUTOMATIC SHUTOFF VALVE Robert C. Franklin 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? 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.</p> |
