| 摘要 |
A cistern for flushing a toilet is disclosed in which a water storage vessel (1) is provided by an elongate upright tube. A discharge port is provided in the base of the tube and is normally sealed closed by a float (7) retained in place by the pressure differential between the overlying column of water and the atmosphere. The discharge port is formed in a flushing control valve assembly (6) which includes a piston (12) operable to simultaneously displace the piston (12) from the discharge port and to reseal the discharge port. The float (7) then floats up until it engages a stop (5). The piston (12) is then operated to unseal the discharge port so that the column of water carries the float (7) down to reseal the discharge port. The cistern has the advantages of being quite and always filled with water and so very quick to cycle such that the cistern can flush quick succession. The height of the column of water produces a more powerful flushing effect than is possible with a conventional gravity fed cistern so reducing the volume of water required for flushing.
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