FIELD: separation or sorting of solid materials.SUBSTANCE: proposed group of inventions can be used in separation plants that can be used in mining, pharmaceutical, food, medical and other industries for the separation of mixtures of liquid and solid. In particular, it can be used for vibrating separators in the oil industry. One of the versions of the of the screen assembly system comprises a screen assembly comprising a frame having a pair of parallel opposite sides and a pair of parallel opposite ends; a convex underside of said frame; a top side of the frame opposite to the convex underside, wherein the top surface is substantially flat; and at least one layer of a screen fixed to the top surface of said frame and intended for separating solid materials and liquids; and a deck comprising a deck base on which the screen assembly is placed. Top side of the deck base in contact with the convex underside of said frame is substantially flat. Method of mounting the screen assembly into a vibrating separator inc
