Patent ID: 6705330
Filing Date: 2004-03-16
Classification: A47L

Abstract:
Dishwashing machine, in which the washing liquor flows into a liquor-carrying circuit that comprises at least two rotating spray arms, a circulation pump, a liquor distribution valve (5) arranged on the delivery-side section of said pump and provided with at least two outlets (51, 52, 53), in which the first outlet (51) leads to a first conduit (61) extending up to a first rotating spray arm, whereas the second outlet (52) and any further outlet (53) that may be possibly provided lead to respective conduit (62, 63) extending up to other corresponding rotating spray arms, said valve (5) being her provided with at least a shutter member (8), which:is adapted to keep, by the effect of gravity, a stable position in which it shuts said first outlet (51) when the machine is not operating and during a first phase of operation of the pump, but leaves a calibrated passage (55) open, which directly connects the delivery-side section of the pump with the first one (61) of said conduits; is adapted to be displaced into a first unstable position, adjacent to a second outlet (52) of the distribution valve (5), during a stop period of the pump having a first pre-set duration (D1), owing to the action of the washing liquor flowing backward along the same first conduit (61); is adapted to shut said second outlet (52) in a subsequent phase of operation of the pump which substantially starts before said first conduit (61) becoming completely empty, characterized in that the shutter member (8) is further adapted to be displaced into a second unstable position (7) following a stop period of the pump having a second pre-set duration (D2), which is different from said first duration (D1), so as to enable at least two rotating spray arms to operate at the same time.