Patent ID: 8596609
Filing Date: 2013-12-03
Classification: B60T,F16K

Abstract:
1. A solenoid valve comprising: a magnet assembly and a valve cartridge, the valve cartridge including a pole core, a valve insert connected to the pole core; an axially movable armature guided axially movably inside the valve insert between a closed position and an open position, the armature being coupled to a closing element; and a valve body connected to the valve insert, the valve body having a main valve seat which is disposed between at least one first flow opening and a second flow opening, and when current is supplied to the magnet assembly, the axially movable armature is moved in a direction toward the pole core by a generated magnetic force inside the valve insert which is counter to a spring force of a restoring spring and counter to a fluid force in order to lift the closing element out of the main valve seat and to enable a fluid flow between the at least one first flow opening and the second flow opening, and the axially movable armature is moved away from the pole core by the spring force of the restoring spring and by the fluid force inside the valve insert in order to press the closing element sealingly into the main valve seat and to interrupt the fluid flow between the at least one first flow opening and the second flow opening, wherein the fluid flow between the at least one first flow opening and the second flow opening is in a stroke-closing direction, wherein courses of the magnetic force, the spring force, and the fluid force are combined over a stroke course of the armature and the closing element in such a way that between a closed position and an open position of the armature and the closing element, at least one further stable operating point is established, which represents a point of force equilibrium with a negative total force gradient, wherein the armature together with the closing element is movable by a partial stroke, by adjustment of a current intensity supplied to the magnet assembly, to lift the closing element out of the main valve seat and operate the solenoid valve in a quasi-stationary, partly open state, and wherein the spring force is furnished by the spring rate of the restoring spring having a progressive course over the stroke course of the armature and of the closing element.