Patent ID: 7165755

Claim:
A motor-operated valve comprising: a valve stem having a valve plug; a valve body having a valve seat with which the valve plug is enabled to removably contact; a can fixed to the valve body; a rotor disposed coaxially in the can; a stator disposed around an outer circumferential surface of the can so as to rotatably drive the rotor; a guide bush secured to the valve body and having an axial hollow portion in which the valve stem is permitted to slidably move; and a valve stem holder which is coaxially disposed around the outer circumferential surface of the valve stem and the guide bush and is enabled to rotate integral with the rotor; wherein the valve stem is enabled to rotate integral with the valve stem holder and to move in the longitudinal direction thereof relative to the valve stem holder; the motor-operated valve further comprising a flow rate adjusting feed screw mechanism, for enabling the valve plug to be in removable contact with the valve seat, which is constituted by a first stationary threaded portion formed on an inner circumferential surface of the guide bush and a first movable threaded portion formed on an outer circumferential surface of the valve stem and adapted to be engaged with the first stationary threaded portion; and with a rotation regulating feed screw mechanism which is constituted by a second stationary threaded portion formed on an outer circumferential surface of the guide bush and a second movable threaded portion formed on an inner circumferential surface of the valve stem holder and adapted to be engaged with the second stationary threaded portion.