A centrifugal separator comprising: a casing which delimits a space which is sealed by at least one seal relative the surroundings of the casing; and in which a rotor is arranged for rotation around a rotational axis (x) and forming within itself a separation space, and in which separation space centrifugal separation of at least one higher density component and at least one lower density component from a fluid takes place during operation, into which rotor at least one inlet extends for introducing said fluid to the separation space, and from which rotor at least one first outlet extends for discharge of at least one component separated from the fluid during operation, and wherein the rotor comprises at least one second outlet extending from a portion of the separation space to the space for discharge of at least one higher density component separated from the fluid during operation, and wherein said second outlet is arranged for intermittent discharge by an intermittent discharge system characterized in that at least one seal is a water seal formed as a labyrinth seal (24, 31) positioned in a paring chamber in said intermittent discharge system and formed by said intermittent discharge system, wherein said labyrinth seal comprises a stationary paring disc and a rotating wing protrusion arranged in said paring chamber, wherein said stationary paring disc extends outwardly radially into the paring chamber to a first radial position and the wing protrusion extends inwardly radially into the paring chamber to a second radial position and the first radial position is further from the axis (x) than is the second position to such an extent that said stationary paring disc and said wing protrusion form said labyrinth seal (24, 31). a casing which delimits a space which is sealed by at least one seal relative the surroundings of the casing; and in which a rotor is arranged for rotation around a rotational axis (x) and forming within itself a separation space, and in which separation space centrifugal separation of at least one higher density component and at least one lower density component from a fluid takes place during operation, into which rotor at least one inlet extends for introducing said fluid to the separation space, and from which rotor at least one first outlet extends for discharge of at least one component separated from the fluid during operation, and wherein the rotor comprises at least one second outlet extending from a portion of the separation space to the space for discharge of at least one higher density component separated from the fluid during operation, and wherein said second outlet is arranged for intermittent discharge by an intermittent discharge system characterized in that at least one seal is a water seal formed as a labyrinth seal (24, 31) positioned in a paring chamber in said intermittent discharge system and formed by said intermittent discharge system, wherein said labyrinth seal comprises a stationary paring disc and a rotating wing protrusion arranged in said paring chamber, wherein said stationary paring disc extends outwardly radially into the paring chamber to a first radial position and the wing protrusion extends inwardly radially into the paring chamber to a second radial position and the first radial position is further from the axis (x) than is the second position to such an extent that said stationary paring disc and said wing protrusion form said labyrinth seal (24, 31).