| 摘要 |
The present invention relates to a drainage device comprising: - an inner chamber, - at least one entry portal and one exit portal communicating with the internal chamber, - at least one shutter placed at least partially in the inner chamber, - at least a first valve seat associated with the entry portal, it being possible for the shutter to fit over the first seat in order to isolate the entry portal from the exit portal, in particular when the differential pressure between the entry and exit portals is less than a predetermined first opening pressure, - at least one passage restriction associated with the exit portal, it being possible for the shutter to close off said restriction, allowing a minimum safe flow rate of greater than or equal to 2.5 ml/h even in a maximum closing-off position, referred to as "closed position", in particular reached for differential pressures between the entry and exit portals of greater than or equal to a predetermined closing pressure. |
