| 摘要 |
<p>PCT No. PCT/EP96/03998 Sec. 371 Date Jun. 11, 1998 Sec. 102(e) Date Jun. 11, 1998 PCT Filed Sep. 12, 1996 PCT Pub. No. WO97/24541 PCT Pub. Date Jul. 10, 1997The invention relates to a double seat valve in which it is possible to clean an upper valve seat and a lower valve seat separately. To that end, a cylinder is provided as the drive mechanism, which in contrast to the prior art makes do with only three pistons. Nevertheless, in the cleaning stroke additional closing force can be brought to bear on a valve plate that is closed in that process.</p> |
