Abstract: The invention relates to a valve device for controlled passage of a medium, in particular in the high-pressure range, which is provided with: a housing (15) having a bore (11) and at least one inlet opening (12) and an outlet opening (13); a pressure chamber (14) which is formed in the bore (11) and can be acted upon by the medium; and a valve needle (16) which is movable to and fro therein and has a conical tip (16?). A guide means (20) for the valve needle (16), by means of which the valve needle (16) with its circumferential region (16?) is guided directly at the conical tip (16?) almost without play and concentrically with respect to the valve seat (17) until it is almost in the closed position, is located in a valve seat (17) in a valve seat block (18). This guide means (20) has passage openings (24) for the passage of the medium from the pressure chamber (14) into the outlet opening (13).

Abstract: Sealing system of a device for allowing the passage of a medium, in particular in the high pressure range, is provided with a housing that has a bore hole, a component mounted within the housing such as to oscillate and/or rotate and with a pressure chamber formed within the bore hole. A sealing element surrounding the component adjoins this pressure chamber which can be charged with the medium. An additional metal seal is formed here by the housing and a pressure disc surrounding the component. The outer region is thus tightly closed after the sealing element. In this way, the sealing element is completely tightly encapsulated on the outside.

Abstract: Sealing system of a device for allowing the passage of a medium, in particular in the high pressure range, is provided with a housing that has a bore hole, a component mounted within the housing such as to oscillate and/or rotate and with a pressure chamber formed within the bore hole. A sealing element surrounding the component adjoins this pressure chamber which can be charged with the medium. An additional metal seal is formed here by the housing and a pressure disc surrounding the component. The outer region is thus tightly closed after the sealing element. In this way, the sealing element is completely tightly encapsulated on the outside.