| 摘要 |
In a device for shutting off the flow of a fluid through a duct, preferably in a system for filtering drinking water, means for shutting off the duct comprise at least one obturator (14,22,35,43) disposed over a corresponding orifice (11) of the duct and means (15,23,36) for restraining the obturator (14,22,35,43) in a position such that the corresponding orifice (11) is not shut off, the restraining means being exposed to the flow of fluid through the duct and being able to undergo a change of state consequent upon the period of exposure to the flow in order to release the obturator (14,22,35) so that it shuts off the duct after a predetermined flow of fluid has taken place through the duct. |
