Dirt separator

A dirt separator for a vacuum cleaner comprises a filter assembly (120, fig 10) to separate dirt from an airflow moving through the dirt separator, a bin 130 to collect dirt separated from the airflow, the bin comprising an opening102, and a valve 110 movable between a closed position in which the opening is obstructed by the valve (fig 5), a first open position in which the opening is unobstructed by the valve (fig 6), and a second, different open position in which the opening is unobstructed by the valve. The valve is moveable from the closed position to the first open position in response to suction within the dirt separator. The bin is moveable relative to the valve between a first position and a second position. The valve is moveable from the closed position to the second open position in response to movement of the bin from the first position to the second position.