Patent ID: 7537026

Claim:
An on-off valve comprising a plunger guided in a casing which is pretensioned in a base position and which can be switched electrically or hydraulically so as to block or open a connection between a first and a second port, wherein the plunger has a plurality of parallel control edges each of which delimits a sectional opening cross-section by a case-fixed control edge, and wherein said sectional opening cross-sections arranged in parallel in a hydraulic manner can be jointly actuated to open or close when the valve is switched, wherein the respective case-fixed control edges are formed at a circumferential sealing land of the casing, a valve sleeve of the casing is composed of a plurality of disks at each of which one of the sealing lands is formed and each of which includes at least one pressure medium conduit opening into a radially expanded disk chamber adjacent to the sealing land, and the pressure medium passages of adjacent disks are alternately connected to the first or second port in a hydraulic manner.