| 摘要 |
The invention relates to a double seat valve capable of cleaning the seat and having a cleaning device for a housing penetration critical for cleaning, According to the invention, a double seat valve of generic type ensures cleaning of the housing penetration of the pipe shaft or the pipe shaft expanded into a pressure compensation piston of the independently driven first closing element, starting from the valve housing part to an axial extension length of at least the entire opening stroke of the double seat valve, and the related relevant prior art is thus improved. This is achieved according to the invention in that, when a first closing element (3) is moved downward by the first partial stroke (T1), a freely penetrable ring gap (S21) is formed between an outer surface (K) of the pipe shaft (3b/3c) and a first rod seal (21) disposed in the first valve housing part (1a). |
