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近几年来,由于节能工作的需要,要求提高流量测量的精度,随着科学技术的发展,变送器和显示仪表的精度有了进一步的提高,因此,在用节流装置进行流量测量时,其流量系数的不精确度就成了流量测量不精确度的主要部分。对某些节流装置,尽管已经有了国际标准或国家标准,但由于加工和测量上的困难,不大可能使其完全符合
In recent years, due to the need of energy saving, it is required to improve the accuracy of the flow measurement. With the development of science and technology, the accuracy of the transmitter and the display instrument has been further improved. Therefore, when measuring the flow with the throttling device, The inaccuracy of the flow coefficient becomes a major part of the inaccuracy of the flow measurement. For some throttling devices, despite the existence of international or national standards, it is unlikely that they will be fully complied with due to processing and measurement difficulties