Centrifugal separator with valved outlets

In combination with a centrifugal rotor mounted for rotation about an axis and having a separating chamber, a plurality of valves located at the outer periphery of the rotor and adapted to be opened during rotation of the rotor to discharge a separated medium from said chamber, each valve comprising a control member movable in the direction of said axis to open the valve, each valve also comprising an inner part and an outer part adapted for displacement relative to each other in the direction of the rotor axis and forming an inner space which is closed at one end and which communicates with the separating chamber, a first of said parts having a sleeve-shaped section of relatively hard and erosion-resistant material, said section extending in the axial direction of the rotor and having an opening for discharging medium from said space, said opening being covered by the other of said parts when the valve is closed, said other part having an annular end edge of relatively hard and erosion-resistant material, said control member having an annular abutment surface of relatively soft material which is pressed in the axial direction of the rotor against said end edge when the valve is closed, whereby said abutment surface seals against the end edge to form a sealing place which prevents said medium from forcing its way through the valve, said end edge being operable by said relative displacement of the inner and outer parts to uncover said opening and thereby establish a communication between said inner space and ambient atmosphere, said opening being spaced from said abutment surface by a distance sufficient to prevent said medium from impinging upon said surface while discharging through the opening when said opening is uncovered by said end edge.