Abstract: The invention relates to a rotary lobe pump (10) for conveying fluids, in particular liquids laden with solid matter, comprising a casing (45) and at least one pair of intermeshing rotary lobes (1) arranged inside the casing (45), each rotary lobe (1) having at least one recess (13, 43) formed on the circumferential surface (5) thereof and/or at least one recess (41) formed on an end surface (7, 9) thereof. The invention relates to in particular a rotary lobe pump, in which at least one trap member (15, 17, 39, 51) is arranged in at least one recess (13, 41, 43) and is adapted to capture solid matter. The invention also relates to a rotary lobe (1) for a rotary lobe pump (10) for conveying fluids, in particular liquids laden with solid matter, said rotary lobe having at least one recess (13, 43) formed on the circumferential surface (5) thereof and/or at least one recess (41) formed on an end surface (7, 9) thereof.

Abstract: A pump (1) with one or more pistons (3; 103; 203; 303; 403), which can be rotated, especially for conveying essentially liquid media, the piston (3; 103; 203; 303; 403), having at least regionally a surface layer (17; 117; 217; 317; 417) of a polymer, especially of an elastomer, is constructed so that at least one recess (19; 119; 219; 319; 419), into which a supporting body (20; 120; 220; 320; 420) can be introduced for expanding the polymer layer (17; 117; 217; 317; 417), is assigned to the polymer layer.