Abstract: A multiport valve for a dust-collection system has a pair of axially spaced seats for two of the ports which can be selectively engaged by a valve member in the form of two oppositely convex shells adapted to bear against one another at their edges. In addition, the shells can be separated so that each engages one of the seats. The actuator for the valve member or plate comprises two telescoping members which can be collectively or individually shifted in the axial direction. These members may be connected by swivel joints to the valve plate.

Abstract: A device for the groupwise cleaning of filter tubes in a filter assembly in which the tubes are disposed in a plurality of parallel rows with each tube being connected to a rod forming a tube carrier and having a seat upon which a spring bears. The other end of each spring engages an arm of a rocker which acts upon two rows of tubes.