Method and apparatus for the realization of a leakage-free switching double seat valve adapted for cleaning seat surfaces

Abstract From the Canadian patent

A method and apparatus for the realization of a leakagefree switching double seat valve allowing cleaning of seats. The method ensures that in double seat valves comprising closing elements of which one is structurally designed as seat disk and the other slide-like, there can be realized a leakage-free switching and the possibility of simultaneous cleaning of the seat surfaces of both closing elements and/or the cleaning of the seat surface of only the slide-like closing element possibly subjected to product action. These advantages are achieved inter alia in that prior to the opening movement of the closing element designed as seat disk, the structurally slide-like designed closing element …