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Vortex flowmeters feature low pressure loss, high reliability, minimal maintenance requirements, and a good performance-to-cost ratio. In terms of measuring liquid flow rates, they are primarily used in the following areas: (1) the measurement of flow rates for various industrial water applications, including circulating water, wastewater, and waste liquids used in various production processes in industries such as chemicals, light industry, power generation, metallurgy, building materials, and petroleum. (2) Flow measurement of some low-viscosity oils, such as gasoline, kerosene, and diesel, as well as the flow measurement of heavy oils and residue whose viscosity is reduced by heating. (3) Measurement of water flow rate in large-diameter pipes: full-bore vortex flow meters are mainly used for pipes of medium and small diameters, while insert-type vortex flow meters can be employed for measuring flow rate in large-diameter (DN≥300 mm) pipes. It is widely used in urban water supply pipelines as well as in the industrial water supply pipelines of enterprises in industries such as chemicals, power, metallurgy, papermaking, and chemical fibers. (4) Measurement of some corrosive liquids, such as acids like sulfuric acid, hydrochloric acid, nitric acid, acetic acid, and various chemical solutions. (5) Measurement of non-conductive liquids: While electromagnetic flowmeters play a dominant role in measuring the flow rate of conductive liquids, they are ineffective in this regard for non-conductive liquids; whereas vortex flowmeters are very useful for such applications. Small-diameter (DN) versions introduced in recent years