| 摘要 |
The invention concerns a method and apparatus for measuring liquid flow in a pipe (8). According to the invention, the measurement is made by causing the liquid flow to be measured to go through a pressure cutting valve (1), the pressure difference of the liquid flow is measured across the pressure cutting valve (1) and the flow corresponding to the pressure difference is determined by comparing the pressure difference with a dependence that has been determined in advance between the pressure difference and the flow in corresponding measuring circumstances. The measuring apparatus according to this invention comprises a pressure cutting valve (1) installed as part of the pipeline (8) in the direction of flow, and the pressure measurement points (3, 4) installed both before and after the pressure cutting valve (1), a pressure difference transmitter (2) for measuring the pressure difference between the pressure difference points (3, 4), and means (5) for converting the pressure difference into the desired measurement data.
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