| 摘要 |
<p>The device has a cover (10) forming an annular orifice (9) through which water flows. A sound-dampening element (16) is projected into an inlet (3), and arranged in the cover. The sound-dampening element passes air into the water flowing into the inlet during dewatering, and controls suction of air through the annular orifice. The element is projected into a drain pipe (6) with its lower end (16b), and has an upper air suction opening (26) arranged above or in the cover and openings arranged between an upper end (16a) and the lower end.</p> |
