Motor-operated valve
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United States of America Patent
Stats
-
Feb 24, 2009
Grant Date -
Nov 23, 2006
app pub date -
May 1, 2006
filing date -
May 19, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A motor-operated valve has a rotor unit in a can, and is rotationally driven by a stator unit. The rotation of the rotor unit is transmitted to a screw feed member. A stem member fixed to a valve body is engaged threadedly with the screw feed member by a first screw portion. At the same time, the screw feed member is engaged threadedly with an external thread portion fixed to a valve stem by the second screw portion. The first screw portion and the second screw portion constitute a differential screw mechanism, and feeds the valve stem according to a difference in pitch.
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