Centrifugal separator having whistle-reducing rotor

A centrifugal separator including a centrifuge rotor, rotatable in a rotary direction around a rotary axis, and a casing, which forms an outer space for the rotatable rotor, wherein the rotor includes a rotor wall, which defines an outer periphery of the rotor and encloses an inner space, at least an inlet, which extends through the rotor wall and permits feeding of a product to the inner space, and a number of outlets, which extend through the rotor wall and are arranged to permit intermittent discharge of a separated product from the inner space to the outer space, wherein said outlets are distributed around the periphery of the rotor, said number of outlets being uneven;

• wherein the rotor includes a valve member, which is provided inside said outlets and arranged to be in a closed position, in which said discharge is prevented, and in an open position, respectively, in which said discharge is permitted;
• wherein the valve member in the closed position extends around the rotor wall in such a way that a gap-like space is formed between the rotor wall and the valve member at the level of said outlets.