Abstract: Hydraulic syphon with automatic reflux, working in tanks disposed at whichever height from the discharge point, particularly for the discharge of the tanks for the flushing of water closets.Two cylindrical tubular elements are disposed, in a position reciprocally inverted with respect to each other, into two other cylindrical tubular elements in such a way as to form annular communicating cavities, which in the syphon's resting position are filled with liquid and gas under pressure. It is thereby obtained an equilibrium between the outer hydrostatic pressure and that inside the syphon.Bell shaped floating means are solid with one of the cylindrical tubular elements, which are however all solid with each other and, through these, with sealing means made of elastic material, which take care of the closing and respectively opening of the tanks.

Abstract: A liquid siphon including a tank and a pair of concentric shells within the tank. One end of the external-most shell has an enlarged bell part formed thereon. A deformable gasket is retained against an interior portion of the bell part to close the same. A passageway in the bell part communicates the interior thereof with the outside surface and is closed by the gasket when the same is deformed by priming the siphon.