| 摘要 |
Pendulous drainage device, of the type comprising at least one outlet pipe (1) mounted movably between an upper position (4) and a lower position (5), inside a tank (2) supplied with a liquid (3), and communicating at its lower part with a discharge conduit (6) situated outside the tank, characterised in that the free end of the outlet pipe (1) comprises a buoyancy unit consisting of an annular cell (8), inside which the mouthpiece (9) of the said outlet pipe opens. Application in particular to the area of sewerage for broad irrigation. <IMAGE>
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