The invention relates to a rotating machine (1), especially a decanter centrifuge, comprising a bowl (2) rotatable about an axis (5) to generate a cylindrical pool of a feed slurry, said bowl (2) having a heavy phase discharge port (10); and a base plate (6) provided at one longitudinal end (8) of said bowl (2); at least one outlet opening (9) provided in said base plate (6); a liquid phase discharge port member (14, 22) placed over the at least one outlet opening (9); characterised by said liquid phase discharge port member (14, 22) including at least one channel (17) with a longitudinal axis (18); wherein the longitudinal axis (18) of said channel (17) extends at an acute angle ( ± ) relative to said base plate (6) and said channel (17) has an extension in the direction of said longitudinal axis (18). The invention also relates to a liquid phase discharge port member (14, 22) adapted to be placed over an outlet opening (9) of a rotating machine (1), especially a decanter centrifuge.