Electromagnetic solenoid valve with variable force motor

Claim 1

An electromagnetic variable force motor circuit comprising: a solenoid including a coil, a pole piece associated with said coil, a ball armature, means defining a first seat, spring means urging said ball armature toward said first seat and away from said pole piece, means defining a fluid chamber adjacent said first seat, said ball armature and said first seat defining a first orifice extending between said ball armature and said fluid chamber, first passage means for providing supply pressure to said fluid chamber, means defining a fixed second orifice associated with said first passage means, a valve device including a movable member spaced from and out of contact with said ball armature at all times and positioned adjacent the fluid chamber so that it is responsive to fluid pressure in said fluid chamber, second passage means for providing supply pressure to said valve device urging said movable member toward said fluid chamber, third passage means for providing control flow from said valve device, fourth passage means for providing exhaust flow from said fluid chamber when said ball armature is moved away from said first seat such that said ball armature controls flow through said first orifice to said fourth passage means upon excitation of said coil, said device being operable to variably restrict flow in said second and third passage means.