The invention relates to a rotary distribution valve, suitable for fluid injection into soil, comprising a shaft (2) having a mounting end (2A), configured to be mounted on a frame (41) and a free hanging end (2B) a distribution carrousel (31) with a cup shaped distribution chamber (37) a seal (24) wherein the cup shaped distribution chamber (37) surrounds the free hanging end (2B) of the shaft (2) and the seal (24) is arranged between an inner wall (17) of the cup shaped distribution chamber (37) and the shaft (2).
