Double-seat valve having a seat-cleaning function, and method for cleaning said double-seat valve having a seat-cleaning function

摘要

A double-seat valve having a seat-cleaning function, wherein the double-seat valve opens downward, and the two closing elements can be moved independently of each other by a partial lift in each case gap-wide into a seat cleaning position for the purpose of cleaning their seat such that the dependently driven second closing element is pushed into its respective seat cleaning position by a second partial lift in the same direction of the opening movement, and the independently driven first closing element is pushed into its respective seat cleaning position by a first partial lift in the direction counter to the opening lift.