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Liquid separator having a centrifugal separator and a fine separator through which a gas to be purified can flow. The centrifugal separator has a cylindrical housing with a tangential inlet and an axial outlet. The fine separator has a housing which defines a space and is isolated from the inner spa

Liquid separator having a centrifugal separator and a fine separator through which a gas to be purified can flow. The centrifugal separator has a cylindrical housing with a tangential inlet and an axial outlet. The fine separator has a housing which defines a space and is isolated from the inner space of the centrifugal separator using a non-return valve.

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1. Liquid separator configured to enable circulation of a gas to be purified, said liquid separator comprising: a centrifugal separator comprising a cylindrical housing with a tangential inlet and an axial outlet and an inner space; anda fine separator comprising a housing arranged to define a space

1. Liquid separator configured to enable circulation of a gas to be purified, said liquid separator comprising: a centrifugal separator comprising a cylindrical housing with a tangential inlet and an axial outlet and an inner space; anda fine separator comprising a housing arranged to define a space; said space being isolated from the inner space of the centrifugal separator by a non-return valve,wherein said non-return valve is configured to allow a fluid to flow from said inner space of the centrifugal separator to the space in the fine separator. 2. Liquid separator according to claim 1, wherein the housing of the fine separator is mounted against the housing of the centrifugal separator. 3. Liquid separator according to claim 2, further comprising a flow-through element within the fine separator. 4. Liquid separator according to claim 3, wherein the flow-through element comprises a fine filter. 5. Liquid separator according to claim 4, wherein the fine filter comprises a coalescence filter. 6. Liquid separator according to claim 1, further comprising a flow-through element having a cylindrical tube with walls that are permeable to gas. 7. Liquid separator according to claim 1, wherein the nonreturn valve comprises a valve body which, when the non-return valve is closed, co-operates with a seating formed by an upper wall of the centrifugal separator. 8. Liquid separator according to claim 7, wherein the valve body is provided with a guiding pin on either side. 9. Liquid separator according to claim 8, wherein a first pin of the guiding pins is directed towards the centrifugal separator and is shiftable in guiding means that are formed of a conical body which is fixed to the housing of the centrifugal separator and which is directed against the direction of flow of the gas with a sharp end, and in which is provided a guiding channel in which said first guiding pin is shiftable. 10. Liquid separator according to claim 8, including a second guiding pin directed towards the fine separator and which is shiftable in a small guiding channel extending in a bottom wall of the flow-through element. 11. Liquid separator configured to enable circulation of a gas to be purified, said liquid separator comprising: a centrifugal separator comprising a cylindrical housing with a tangential inlet and an axial outlet and an inner space; anda fine separator comprising a housing arranged to define a space, said space being isolated from the inner space of the centrifugal separator by a non-return valve,wherein the space in the fine separator is connected to a take-off point for purified gas via a minimum pressure valve.