Abstract: Device for feeding material from a pressurised space to a space at a lower pressure, said device comprising a frame (2) with an admission port (5) and a discharge port (6), and a feed element (1) rotatably mounted inside the frame, said feed element containing at least one chamber space (3, 4) opening at the surface of the feed element, as well as means (7, 8) for turning the feed element between at least one first position, in which the chamber space (3, 4) communicates with the admission port (5), and at least one second position, in which the chamber space communicates with the discharge port (6), as well as at least one sealing element (9, 10) fitted against the surface of the feed element. The device is provided with a passage from the side of the admission port (5) to the side of the discharge port (6), said passage being open in at least one position of the feed element (1).