Patent ID: 7007917

Claim:
An electromagnetic control valve comprising: a valve body having first and second ports for communicating an inside and an outside of the valve, an orifice inside thereof for making the first and the second ports in communication, and a space inside of an upper part thereof; a permanent magnet fitted in the space to be movable in an up/down direction; a coil connected to a circuit and wound on an outside circumferential surface of the valve body; a first yoke fitted to surround the outside circumferential surface of the valve body at a position opposite to an upper part of the permanent magnet for sustaining a levitated state of the permanent magnet by a magnetic force; and a needle having a tapered tip disposed at a position opposite to a side of the orifice, for making linear variation of an opened area of the orifice while the needle moves together with the permanent magnet when the permanent magnet moves up or down by an electromagnetic force generated when a current is applied to the coil.