Patent ID: 7114509

Claim:
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 ).