Patent ID: 7325780

Claim:
A motor operated valve with a reduction gear comprising: a valve body having a valve chamber and a valve seat; a valve member disposed in the valve chamber and movable on a longitudinal axis to open and close an opening of the valve seat; a valve shaft for operating the valve member; a cylindrical can fixed to the valve body and defining therewith an enclosed space centered on said axis; a motor exciter comprising a stationary stator coil mounted on an outer circumference portion of the can and centered about said axis; a permanent magnet rotor rotatably supported at an inner circumference portion of the can and driven to rotate by the exciter; a reduction gear for reducing the rotation of the rotor; and a screw mechanism for moving the valve member toward and away from the valve seat via the reduction gear by the rotary movement of the rotor, and the reduction gear and the rotor being disposed together in said enclosed space and being centered on and rotatable about said axis to form a compact coaxial motor operated valve with gear reduction.