Piezoelectric fluid control valve
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United States of America Patent
Stats
-
Feb 12, 2002
Grant Date -
Nov 8, 2001
app pub date -
Apr 18, 2001
filing date -
May 8, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The piezoelectric element laminate 20 which expands due to application of a voltage is disposed between a diaphragm valve 11 applied with elastic force in a valve opening direction and a valve spring mechanism 25, a distortion amount a of the piezoelectric element laminate 20 in expansion is set to be larger than an opening/closing stroke b of the diaphragm valve 11, and a spring seat 28 separates from a second stopper 30 due to a difference c between the distortion amount a and the opening/closing stroke b. As a result, when the piezoelectric element laminate 20 expands to seat the diaphragm valve 11 on a valve seat 10, the valve spring 29 is compressed and repulsing force of the valve spring 29 acts on the diaphragm valve 11 through the piezoelectric element laminate 20 and the diaphragm valve 11 is pressed against the valve seat 10 by the repulsing force.
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