| 摘要 |
A siphon assembly for a flushing cistern, said assembly including an inverted generally U shaped duct having an up leg and a down leg the up leg being provided with an enlarged chamber having a lower end open to the interior of the cistern in use and the down leg forming an outlet from the cistern in use for delivery of flushing water; and a vertically displaceable piston incorporating a flexible diaphragm acting as a one way valve, said piston being movable in said chamber to initiate a siphonic flushing action operatively discharging water through said duct from the cistern; a side wall of the chamber defining a venting aperture intermediate the top of the chamber and said lower open end, the assembly further including a first closure element secured in engagement with the venting aperture, the first closure element being shaped so as to define at least a first predetermined flush level lower than a top edge of the venting aperture when so secured.
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