| 摘要 |
<p>The invention concerns a valve wherein a closure element (22) can be displaced under the action of external means generating a magnetic field (32). The invention is characterised in that the chamber (14) comprises at least two working sections (16, 18) with different cross-section, and the closure element (22) can take up, besides the closing position, at least a withdrawn position and an intermediate position so as to determine at least two different flow rates for the fluid through the valve (10), and the magnetic field generated is asymmetrical so as to press the closure element (22) transversely against a portion (38) of the valve body (12) which, over the entire axial travel of the closure element in the chamber, has a substantially constant thickness.</p> |
