Motor operated valve

A motor operated valve comprising:

• a body including an inflow port through which fluid is introduced from an upstream side, an outflow port through which the fluid is delivered to a downstream side, and a passage through which the inflow port and the outflow port communicate with each other;
• a valve element to open and close a valve section provided on the passage;
• a motor including a rotor for driving the valve element in opening and closing directions of the valve section;
• a feed screw mechanism to convert rotational movement of the rotor into translational movement;
• and
• a stopper mechanism to restrict the translational movement of the rotor, wherein
• the feed screw mechanism includes:
• a guiding part mounted vertically on the body, and including an external thread portion on an outer surface thereof;
• and
• a guided part made of a cylindrical member constituting a rotation shaft of the rotor, including an internal thread portion on an inner surface thereof, and mounted around and thus supported by the guiding part, the internal thread portion being engaged with the external thread portion,
• the stopper mechanism includes:
• a stopper portion provided on the guided part;
• and
• a stopping face formed integrally with the guiding part, and
• when the valve element is driven by the motor to move in a valve closing direction, the stopping face stops the stopper portion to restrict the movement of the rotor in the valve closing direction,
• the stopper portion sticks out from an open end portion of the guided part in an axial direction of the rotor,
• when the valve element is driven by the motor to move in the valve closing direction, the stopper portion is stopped by the stopping face in a rotating direction of the rotor, so that the movement of the rotor in the valve closing direction is restricted,
• the motor includes a stator for driving the rotor in the opening and closing directions of the valve section, and
• an area in which the rotor and the stator face each other is maximum when the stopper portion is stopped by the stopping face.