Switching valve and an electro-pneumatic pressure converter utilizing the same
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United States of America Patent
Stats
-
Oct 21, 1986
Grant Date -
N/A
app pub date -
Jul 18, 1985
filing date -
Jul 31, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A switching valve has at least one plate-shaped piezo-electric element having a free end which is supported in a sealed chamber, at least two fluid directing nozzles arranged to be opened or closed due to the position of the free end of the piezo-electric element and a fluid output passage communicating outwardly from said sealed chamber. An electric-pressure converter uses the switching valve, a pilot relay for converting a fluid pressure signal delivered from the output passage into a standard air pressure signal, a pressure sensor for converting the pressure signal from said pilot relay into an electrical signal, pulse-width modulating means for providing a pulse-width modulated signal, which corresponds to the deviation between the electrical signal from the pressure sensor and an external reference electric signal, for energizing the plate-shaped piezo-electric element in the switching valve.
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