Variable pressure valve apparatus
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United States of America Patent
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-
Nov 5, 2002
Grant Date -
N/A
app pub date -
Jun 13, 2000
filing date -
Jun 15, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A variable pressure valve apparatus has a case having a fluid inlet port and a fluid discharge port, a valve element for closing the fluid inlet port, a spring member disposed in the case for biasing the valve element to close the fluid inlet port, and a cam wheel for undergoing rotation to deform the spring member and thereby vary a biasing force applied to the valve element by the spring member. A feed ratchet is disposed in the case for undergoing movement to rotate the cam wheel. A shape memory alloy or a piezoelectric element undergoes extension movement to move the feed ratchet to thereby rotate the cam wheel to deform the spring member.
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