(57) A dishwashing machine comprises a wash tub (3), an electric pump (87) for supplying
water from a bottom (3a, 88) of the tub (3) to a sprinkler system (83-86), a switchable
device (40), operatively set downstream of a delivery section of the electric pump
(87), for controlling supply of water to the sprinkler system (83-86), a water-storage
system (30, 45, 46, 50) comprising a tank (30) and a control system including control
means for issuing a command for start-up of at least one program for treatment of
the dishes that includes at least one step of charging water from the water mains
to the tub (3), at least one step of treatment of the dishes, and at least one the
step of filling of the tank (30). The switchable device (40) comprises a casing (41),
mounted displaceable within which is a distributor member, which can be actuated by
an actuator for assuming a plurality of operating positions, amongst which at least
one position of opening a first outlet (44), for supplying a first sprinkler (83),
and of simultaneously closing another outlet (43), for supplying a second sprinkler
(84). The casing (41) of the switchable device (40) has a third outlet (45) that is
always open; i.e., it is open irrespective of the operating position assumed by the
distributor member. The third outlet (45) is connected via a third pipe (46) to a
first opening (39a) of the tank (30) that functions alternatively as inlet and as
outlet for the water with respect to the cavity of the tank. Between the third outlet
(45) and the first opening (39a) of the tank (30) valve means (50) operate, which
can be controlled independently of the switchable device (40).
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