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藉助于孔板测定液体、气体及蒸汽流量的方法是以气流中的压力降为依据。在法国用这种方法测定流量的设备是由管路中用以收缩的孔板装置或差动式压力表的文氏管及连接管等组成（喷咀及文氏管）。 法兰西标准化协会Asscciation Francaisede Normalisation（AFNOR）采用这种通用方法为法国标准,并推薦为国际标准。 上述方法可用以测定任何液体、气体及蒸汽流量,只要它均匀地分佈于整个管路和无脈动即可测定。
The method of determining the flow of liquids, gases and vapors by means of orifice plates is based on the pressure drop in the gas stream. The device for measuring flow in this way in France consists of Venturi tubes and connecting tubes, etc. (nozzle and venturi), which are used to shrink orifice plate devices or differential pressure gauges. The Asscciation Francaise de Normalisation (AFNOR) uses this common method as a French standard and is recommended as an international standard. The above method can be used to determine the flow of any liquid, gas and steam, as long as it is evenly distributed throughout the pipeline and no pulse can be measured.