Self-priming siphon, in particular for irrigation

Self-priming siphon formed by a tube whose shape is similar to that of an inverse U, inside which is found hydrophilic material, comprising a rising branch (10), a bend and a descending branch (8), characterised by the fact that the descending branch (8) of the tube (9) is extended by a pipe (12) with a smaller diameter than the diameter of tube (9) in such a manner that when the other rising branch (10) of tube (9) is plunged into a receptacle (2) containing a liquid (3), and the latter fills rising branch (10) of tube (9) up to a higher level (11) of said liquid, then continues its ascension by capillary action to cross the high point (30) of tube (9) and fall again descending branch (8) as far as pipe (12), it forms there columns (20), which carried along by their weight, cause a suction priming the siphon, if the level of the exit of the pipe (12) is lower than the level (11) of the liquid.