With the development of Velbar flowmeter technology, more and more flow measurement methods are being applied to various industrial fields. Among them, differential pressure flow meters have always played a very important role in flow measurement due to their low price, wide application scenarios, long-term usage experience, and increasingly high accuracy.

Based on the differential pressure generated by the flow detection component installed in the pipeline, known fluid conditions, and the geometric dimensions of the detection component and pipeline, different differential pressure gauges can be selected to improve detection accuracy, stability, and extend the service life of the flowmeter. In long-term engineering practice, the author has explored some practical engineering experience for reference.

Orifice plate is a very mature flow measurement method, and different forms of orifice plates will be selected according to various working conditions. Common types include standard orifice plates, circular orifice plates, eccentric orifice plates, and 1/4 circular orifice plates.

The standard Velbar flowmeter orifice plate is suitable for media that are generally clean and have low viscosity; Circular perforated plates are suitable for media with high viscosity and relatively dirty conditions; 1/4 circular hole plate is suitable for media with high viscosity and low flow rate; Eccentric orifice plates are suitable for flow measurement of fluid containing solid particles.