| 摘要 |
<p>The shut-off valve (1, 40, 85) comprises a valve housing (2) having at least two chambers (3, 4, 5) adjoining one another in axial direction. The chambers are communicating with one another through a passage bounded by a valve seat (6, 7). A valve body (15) is axially movable in the housing and co-operates with each valve seat for closing the associated passage. The valve body is guided with sealed passages through the walls of the axially outer chambers opposite the valve seat (6, 7). The passages and each valve seat have substantially the same diameters. The valve body can be composed of an upper valve body and a lower valve body part both being provided with a sealing ring co-operating with the same cylindrical valve seat.</p> |
