(57) The device includes a closing element (43) for closing the valve (43, 44), and which
is associated with a first float (32, 47) which is raised to open the valve (43, 44);
and a second float (58) concentric with the first float (32, 47), and which is raised
to fully discharge the tank (5). The first float (32, 47) is defined by the overflow
discharge tube (32), the bottom end (34) of which is normally closed by a disk (47)
by virtue of the action of a spring (51). The second float (58) is normally locked
upwards by a hook element (67) engaging a fixed stop (66), so as not to affect the
downward return movement of the first float (32, 47), and so partially discharge the
tank (5). Conversely, when the hook element (67) is released, the second float (58)
draws the discharge tube (32) upwards, and delays closing of the discharge tube to
fully discharge the tank (5).
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