Patent ID: 6814103
Filing Date: 2004-11-09
Classification: G05D,Y10T

Abstract:
A solenoid valve comprising:a housing having a work connector, a pressure connector, and a tank connector; an armature moveably arranged in the housing; a coil arranged in the housing and acting on the armature; a slide moveably arranged in the housing; the slide having a first end, loaded by a supply pressure of the pressure connector, and having a second end, loaded by a return pressure to the tank connector, so as to be hydraulically tensioned by the supply pressure and the return pressure; wherein the slide comprises an auxiliary piston arranged in the second end and delimiting a hydraulic chamber of the slide; wherein the auxiliary piston has a pressure surface facing the hydraulic chamber and loaded by a hydraulic pressure in the hydraulic chamber; wherein the housing has a pressure chamber connected to the pressure connector, wherein the pressure chamber is delimited by the first end of the slide and the supply pressure loads the first end of the slide; wherein the pressure chamber has at least one opening; wherein the armature has a closing element configured to controllably close the at least one opening; wherein the pressure chamber is connected to the tank connector when the at least one opening is open causing the slide to close a connection between the pressure connector and the work connector and to open a connection from the work connector to the tank connector.