DESCRIZIONE
The invention relates to a switching valve (25) positioned in a supply line (20), said switching valve (25) comprising a body between a first end (36) and a second end (37), said first end (36) is substantially planar in which an inlet orifice is positioned, the inlet orifice is of circular shape and has an axis of revolution positioned along a parallel of the longitudinal axis of the switching valve, the second end (37) is substantially planar and comprises a spherical cap (38) on which are positioned at least two outlet orifices, each outlet orifice is circular in shape, said switching valve (25) comprises a movable plug ( 39) contained in the body (35) of the switching valve (25), said movable valve (39) comprises a through and rigid conduit adapted to selectively communicate the inlet port with one of the outlet ports.