A centrifuge (2) for separating the liquid phase from the crankcase gases of an internal combustion engine is disclosed. A centrifuge (2) a separation chamber 12, the rotor shaft 20, the separation chamber 12 the rotor 16 inside the crankcase inlet for gas (6), a gas outlet (8), and separation and a liquid outlet 10 for the liquid. The centrifugal separator (2) comprises a liquid discharge chamber 14, the check valve and the rotary member (18). The liquid discharge chamber 14 forms a separate chamber via the fluid pathway is disposed in fluid communication with the separation chamber (12). Rotational member 18 is coupled to rotor shaft 20 is disposed within the liquid discharge chamber 14. The liquid outlet 10 forms the outlet of the liquid discharge chamber 14. A check valve is disposed in the liquid discharge port (10).