| 摘要 |
The device (1) has a box (7) partially provided with a non-return valve (8) at a top part to allow exit of air from the box during overpressure. A duct (10) connects the top part through a top end (11) to a pumping pit (3) through a bottom end (15). The duct includes a movable part (19), so that the bottom end moves in vertical translation between a low position in which the bottom end is covered with water as long as the tank is not empty, and a high position in which the bottom end is remote from flow of rinsing water from the box to allow the flow of water without being sucked in the duct. |
