Linearly actuated valve
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United States of America Patent
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May 18, 1993
Grant Date -
N/A
app pub date -
Jul 22, 1991
filing date -
Jul 22, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention comprises a linearly actuated valve which includes a valve body, a valve seal linearly movable with respect to the body between closed and open positions, a spring and a shape memory alloy wire. The spring both biases the valve toward the closed position, and forms a part of the electrical circuit providing current to the shape memory alloy wire. The valve seal may be accurately positioned between the closed position and the open position by applying a pulse frequency modulated electrical current to the spring and the shape memory alloy wire. The electrical circuit is continuously closed and is comprised entirely of electrical conductors having no sliding electrical contacts to eliminate arcing and sparking.
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