| 摘要 |
<p>The invention relates to a shut-off device with a casing (2) and with an aperture (3) for a pipe or hose line (29) or a similar apparatus for transporting materials with at least one shut-off element (4, 5) which can move inside the casing (2). The essence of the invention is that the shut-off element (4, 5) is so shaped and/or located and/or is movable in such a way that in the shut position, it is does not completely close.</p> |
