| 摘要 |
<p>The valve (18) has an operable valve slide (22) for adjusting a closing position and an opening position of the valve. A blocking device (29) limits operation of the valve slide on an intermediate position that is provided between the closing position and the opening position, in dependence upon a pressure difference value between pressure before and after the valve, and the limit rises with falling of the pressure difference value. Opening cross-section of the valve in the intermediate position is formed as a fraction of opening cross-section in the opening position.</p> |
