Patent ID: 8746657

Claim:
A multi-piece valve disk of a sliding and/or seat valve for the flow control of beverages, food, pharmaceutical or biotechnical products, the valve disk being shiftable in a linear direction of adjustment in relation to a wall of a seat and comprising at least one ring seal disposed in a ring groove of the valve disk, the ring seal including: a backup ring including an indentation ring groove facing radially outwards or being oriented one of axially or obliquely outwards with axial and radial direction components, the indentation ring groove including a base disposed between two substantially parallel ring ribs; an elastic sealing ring with an approximately C-shaped cross-section including: an inner surface engaging the back-up ring with a positive form-fit, at least one external sealing zone, and an elastic restoring region adjacent to the at least one external sealing zone, the elastic restoring region being embodied as an annular ring projecting inwards from the external sealing zone and being disposed in the indentation ring groove between the base and ring ribs of the indentation ring groove and the at least one external sealing zone, wherein the elastic restoring region and the at least one external sealing zone are formed in one piece of the same material; and a second sealing ring disposed on a respective backup ring, wherein the backup rings are oriented in different rotational positions and the sealing rings have the same shape.