Patent ID: 8297588

Claim:
A motor-driven valve comprising: a male screw member rotating in accordance with a rotation of a rotor of an electric motor and engaging with a female screw member fixed to a valve main body; a valve body contacting to and separating from a valve seat in the valve main body by a rotation of the male screw member; two stopper parts rotating in accordance with the rotation of the rotor of the electric motor, at least one of said two stopper parts being screwed with the male screw member; an opening limit stopper part mounted to the female screw member, said opening limit stopper part contacting with one of the two stopper parts in a fully-opened state of said motor-driven valve to restrict the rotation of the male screw member in a direction that the motor-driven valve opens; and a closing limit stopper part mounted to the female screw member, said closing limit stopper part contacting with another stopper part in a fully-closed state of said motor-driven valve to restrict the rotation of the male screw member in a direction that the motor-driven valve closes.