| 摘要 |
<p>The ventilation device for the continuous and stationary regulation of the flow in an overflow-siphon comprises anair inlet at the top of the siphon through which the air flow entering the upper portion of the siphon is adjustable by means of an adjusting device which is actuated by a control device as a function of the upstream water level variations allowing to continuously modify the free opening of the air line. A choke member is associated to the air inlet, and its adjusting valve is actuable as a function of the level H of the upstream water (2) by a sensor in contact with the upstream water (2). The choke member may be an adjusting valve located in the piping (10), which adjusting valve is actuable by a control rod (12) connected with a pressure transmission means which is in contact with the upstream water (2).</p> |
