The cyclone separator (1) with flow rate regulation is for separating solid particles from a fluid, especially in dental apparatus. The separator comprises a recipient (2) having an inlet (A) for the fluid and an upper outlet (B) for the fluid once the solid particles have been removed therefrom. The separator also comprises a recycling conduit (60) which places an outlet conduit (55) in communication with the inlet (A), a three-way valve (61) to an inlet (61a) of which the outlet conduit (55) is connected, and to outlets (61b, 61c) of which the recycling conduit (60) and the outlet (B) are connected. The three-way valve (61) has an obturator (62) which can block the connection between the outlet conduit (55) and the recycling conduit (60), a one-way valve (63) which has an obturator (64) and is located at the outlet (B) downstream of the three-way valve (61). The one-way valve is normally closed and can connect the outlet conduit (55) with the outlet (B). The three-way valve (61) and the one-way valve (63) are brought into action when the fluid pressure in outlet from the separator reaches first and second predetermined values. <；IMAGE>；
