Patent ID: 8668184

Claim:
A double seat valve, in particular for the flow control of beverages, food, pharmaceutical or biotechnical products, the double seat valve comprising: at least one seat, disposed in a valve chamber between flow paths, the at least one seat including sealing surfaces; first and second valve disks configured to cooperate with the sealing surfaces of the at least one seat, the first and second valve disks being linearly adjustable relative to each other and relative to the at least one seat in a direction of adjustment, the first valve disk comprising a ring groove and a first ring seal with a first elastic sealing ring fixed in the respective ring groove with a preload frictional connection, the first ring seal being configured to generate an at least essentially axial sealing function, the first sealing ring being attached to a respective first dimensionally stable backup ring in the respective ring groove of the first valve disk, the first backup ring including: a base part fixed between parts of the first valve disk, and a backup part introduced into the respective first sealing ring at least with a positive fit and extending obliquely away from the base part at an angle (α); the second valve disk comprising a ring groove and a second ring seal with a second elastic sealing ring fixed in the respective ring groove with a preload frictional connection, the second ring seal being configured to generate an essentially radial sealing function in the seat, the second sealing ring being attached to a respective second dimensionally stable backup ring in the respective ring groove of the second valve disk, the second backup ring including: a base part fixed between parts of the second valve disk, the base part of the second backup ring having at least one of a different shape or different dimensions than the base part of the first backup ring, and a backup part introduced into the respective second sealing ring at least with a positive fit and extending perpendicularly away from the base part, wherein the first and second sealing rings are manufactured with the same shapes and dimensions as one another, and wherein the first and second sealing rings are arranged in rotational positions differing with respect to the respective sealing function relative to the direction of adjustment.