| 摘要 |
<p>A diaphragm (1) for adjusting the useful passage area in submersed devices for oxygenating tanks for collecting storm sewage and wastewater, said devices comprising a water feed pipe (4) which is coupled to the delivery (5) of a pumping element and a branch pipe (6) for feeding air which is inserted downstream of a narrower Venturi tube section, comprising a contoured plate (7) which is crossed by a port (8) with a calibrated diameter which is smaller than the diameter of the feed pipe (4) and can be hermetically inserted in a drawer-like fashion in a corresponding slot (4a) formed transversely in the water feed pipe (4) directly upstream of the insertion point of the branch pipe (6). <IMAGE></p> |
