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1. A hydraulic valve connected to a bottom wall of a tank for containing a liquid, wherein said hydraulic valve engages a through opening delimited through said bottom wall, said hydraulic valve comprising a cage element connected to said bottom wall inside said tank, a shutter movable housed inside said element cage, in an interposed position between said cage element and said bottom wall, wherein said hydraulic valve comprises a hollow connection element which hermetically engages said through opening delimiting a passage which passes through said hydraulic valve to selectively place said tank in fluid communication with the outside according to the position of said shutter, wherein said hollow connection element includes an engaging portion which extends with a free end in said through opening and defines a passage opening to be selectively occluded by said shutter, wherein said shutter is movable according to the liquid in said reservoir between a position distal to said free end causing the opening of said hydraulic valve and a position of abutment against said free end, causing at least partial closure of said hydraulic valve, wherein said hollow connection element comprises radial notches which pass radially through said free end and, when said shutter is in proximity to said free end, said radial notches define respective passages for a liquid sucked out of said tank determining the gradual closure of said hydraulic valve and avoiding the formation and of vortices and a suction of air through said hollow connection element.
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