Dishwashing machine with improved washing liquor distribution valve

Dishwashing machine which comprises a programme sequence control unit, a circulation pump (3) adapted to also operate in an intermittent mode on command of said programme sequence control unit, at least two rotating spray arms, a liquor distribution valve (10) arranged directly on the delivery-side section (6) of said pump (3) and provided with at least a first and a second outlet (11, 13) communicating with the liquor-supply conduits (12, 14) of said rotating spray arms, respectively, and further provided with a shutter member (20) that, depending on the flow direction of the liquor on the delivery side (6) of the pump, is adapted to selectively displace both between said first and said second outlet (11, 13) and into an intermediate accommodation (15) provided between said same outlets, characterized in that it further comprises means (21) for monitoring the pressure of the liquor immediately after the delivery side (6) of the pump, so as to make it possible for the duration of the pauses in the intermittent operation of the pump (3) controlled by the programme sequence control unit to be correlated to the actual pressure of the liquor at the inlet of the valve (10), the connection (18) for said monitoring means (21) of the liquor pressure being arranged in the lower portion of the valve (10), in which the shutter member (20) of the valve (10) consists of a spherical body made of a non-oxidizing material and having a heavier specific gravity than the washing liquor itself, characterized in that said intermediate accommodation (15) between said first and said second outlet (11, 13) of the valve (10) consists of a recess provided with a vent (16) having a connecting line (19) with the intake side (5) of the pump (3).