Abstract: The invention concerns a device for separating water and steam for the drying of a moist steam which has a rising current at the inlet of the device. The device comprises at least an assembly (8) comprising drying elements in a zone (12) in which a perforated panel (11) is located. The perforated vertical panel (11) is formed by a grid of expanded metal for deflecting the incident stream (9) of the steam and rendering it horizontal or sightly downwardly inclined (16). The invention is in particular applicable to steam generators of pressurized water nuclear reactors.