Abstract: A dust extractor comprising at least a first and a second valve arrangement and a pre-separator tank with a pre-filter system, wherein the pre-filter system comprises at least a first part and a second part, wherein each valve arrangement is configured to generate a reverse flow of air to clean an associated part of the pre-filter system, in response to actuation of a respective trigger device configured to place the valve arrangement in a pre-filter cleaning position, wherein the first valve arrangement is associated with cleaning of the first part of the pre-filter system and the second valve arrangement is associated with cleaning of the second part of the pre-filter system, wherein actuation of the trigger devices can be performed alternately wherein only one of the first and second valve arrangements is placed in its pre-filter cleaning position, or with time overlap wherein both the first and the second valve arrangements are placed in their respective pre-filter cleaning positions.

Abstract: A dust extractor includes a first and a second valve arrangement and a pre-separator tank with a pre-filter system. The pre-filter system includes a first part and a second part. Each valve arrangement is configured to generate a reverse flow of air to clean an associated part of the pre-filter system, in response to actuation of a respective trigger device configured to place the valve arrangement in a pre-filter cleaning position. The first valve arrangement is associated with cleaning of the first part of the pre-filter system and the second valve arrangement is associated with cleaning of the second part of the pre-filter system. Actuation of the trigger devices can be performed alternately wherein only one of the first and second valve arrangements is placed in its pre-filter cleaning position, or with time overlap wherein both the first and the second valve arrangements are placed in their respective pre-filter cleaning positions.

Abstract: A pre-filter (200) for a heavy-duty dust extractor (100), the pre-filter (200) comprising a filter aperture (210) and a filter side wall (220), where the side wall is arranged to permit a flow of air to pass the side wall and to prevent at least some particulate matter from passing the side wall, wherein the filter side wall (220) extends away from the filter aperture (210) and tapers inwards towards a center axis (260) of the filter (200) to define a filter interior volume (V), where the pre-filter (200) is arranged to hold a separating wall in position in the filter interior volume (V) to divide the filter interior volume (V) in at least two parts.