Solenoid actuated valve device

Claim 1

A solenoid actuated valve device for electrically controlling the flow of fluid comprising a body having an inlet port and an outlet port, a hollow core positioned within said body and having a first opening and a second opening for providing fluid communication between said inlet and outlet ports, a bobbin slidably mounted on said core and having a valve portion for controlling the effective area of said first and second openings, a solenoid coil wound on said bobbin, permanent magnet means mounted on said body so that the magnetic flux thereof intersects the windings of said solenoid coil at right angles thereto, magnetic means forming a magnetic circuit including said permanent magnet means in cooperation with said core so that forces are generated to cause said bobbin to move in opposite directions when electric current is applied to said coil in opposite directions, first spring means biasing said bobbin in one direction and second spring means biasing said bobbin in the opposite direction for maintaining said valve portion in a position intermediate said first and second openings in the absence of electric current being supplied to said coil wherein said first and second openings being spaced from each other by a portion of said core having no openings, the length of said portion of said core having no openings being of sufficient length so that in the operational position of said valve portion during the de-engergized condition of said coil said first opening will remain completely open and said second opening will remain completely closed, wherein said core is mounted for axial movement within said body and further comprising means for adjusting the axial position of said core relative to said body so as to accurately locate said prtion of said core between said openings relative to said valve portion on said bobbin when said coil is de-energized.