Flow rate control valve and flow rate control system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 15, 2001
Grant Date -
N/A
app pub date -
Apr 26, 2000
filing date -
Apr 30, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A flow rate control valve comprises a driver in which a rotary shaft is rotated to adjust the opening degree of a valve body. The driver is an ultrasonic motor comprising a stator having piezoelectric elements mounted thereto and a rotor mounted to the rotary shaft and resiliently pressed against the stator.
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