A hydrocyclone, particularly for producing starch, has a central block (10) with conical hydrocyclones (15) of conventional design extending through the central block, a cover (18) with hydrocyclone heads (21) which bears against one flat side of the block, and cover plates (24, 27) which bear against the other flat side of the central block and the side of the cover (18) remote from the block, respectively. Inlet ducts (17) to the hydrocyclones are provided in the side of the central block facing the cover, and outlet ducts (25) communicating with the smaller openings (37) of the hydrocyclones are provided in that side of one cover plate (24) which faces the block. Outlet ducts (22) communicating with outlets in the hydrocyclone heads (21) are designed in that side of the cover which faces the other cover plate (27). To permit rapid and tight clamping of block (10), cover (18) and cover plates (24, 27) during operation, at least one cover plate (27) has a hydraulic device in the form of a pressure plate (30) disposed in a recess (28) in the flat side facing the cover (18) and the central block (10), respectively, and can be pressed against the cover or the block by means of a hydraulic fluid which is supplied to the space (31) between the bottom of the recess (28) and the side of the plate (30) facing the bottom.
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