| 摘要 |
<p>A method and apparatus for the realization of a leakage-free switching double seat valve allowing cleaning of seats. Said method ensures that in double seat valves comprising closing elements of which one is structurally designed as set 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 (5 or 4, respectively) designed as seat disk, the structurally slide-like designed closing element (5 or 4, respectively) is advanced from a resting position towards the closing element (5 or 4, respectively) being in its closing position and remains coupled to it during the entire period of the subsequent open position, in that after the closing movement of the closing element (5 or 4, respectively) designed as seat disk the structurally slide-like closing element (4 or 5, respectively) is separated from the former one and shifted to its resting position, and in that for the purpose of cleaning the seat surface the structurally slide-like closing element (4 or 5, respectively) it is individually slidable from its resting position towards the valve casing part (1 or 2) possibly leading the product (FIG. 3.1).</p> |
