The Venturi tube is a throttling flow sensor developed according to the Venturi effect. It is a standard throttling device. The standard (classic) Venturi can be divided according to its manufacturing method. The standard Venturi of the rough casting contraction section; The standard Venturi of the rough welded iron plate contraction section of the machined constricted section. Based on its structural characteristics, Venturi tubes are widely used in various dirty media such as liquids, gases, steam and two-phase flow.