FFM61 Series V-cone flowmeter is a product developed by Floworld Company in 1980s. The product marks a leap in the field of differential pressure flow measurement. The flowmeter measures the pressure difference between upstream and downstream by means of the throttle effect generated by V cone in flow field. Compared with the common throttle sets, it transforms the throttle pattern by changing central hole throttle to circular one. The practice has born out that as compared with other flowmeters, V cone flowmeter enjoys the advantages such as long-term high precision, good stability, little limitation on installation, strong resistance to wear, wide measurement range, small damage due to the pressing and adaptation to the dirty media. In addition, V cone itself serves as rectifier in the flow field and thus becomes a unique and superior new-type flowmeter. The V cone flowmeter composed of V-cone sensor and differential pressure transmitter can accurately measure the flows of media within the range of Reynolds number (8×103≤Re≤5×107).