Motor-driven valve
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United States of America Patent
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Sep 19, 2017
Issued Date -
Dec 22, 2016
app pub date -
Apr 27, 2016
filing date -
Jun 22, 2015
priority date (Note) -
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Abstract
Provided is a motor-driven valve with a simple configuration that can solve hysteresis generated when the rotary direction changes, without greatly changing a conventional motor-driving valve. A friction angle of an external thread and an internal thread of a thread feeding mechanism, a lead angle thereof, and a biasing force of a compression coil spring inserted between a valve shaft and a valve body are set so as to always bias the valve shaft making up the thread feeding mechanism to the valve body in a rotating direction in one direction or in the other direction in both of the upward-moving stroke and the downward-moving stroke.
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