Patent ID: 8794591

Claim:
A motor-operated valve comprising: a motor composed of a rotor and a stator; a valve member being moved toward and away from a valve seat formed on the valve body; and a planetary gear mechanism comprising: a sun gear; one or more planet gears in engagement with the sun gear; an internally toothed fixed gear in engagement with the planet gears; and an internally toothed turning gear in engagement with the planet gears; wherein each planet gear is composed of a first planet gear in engagement with the internally toothed fixed gear and the internally toothed turning gear, and a second planet gear which is formed integrally with the first planet gear and having a smaller module than the first planet gear; and the sun gear is in engagement with each second planet gear, wherein the rotation of the rotor is transmitted to the sun gear, and the internally toothed turning gear is connected to the valve member.