为解决大流量安全阀公称流量特性试验中数据采集及数据处理关键技术难题,应用数据同步采样系统、数字滤波技术、三次样条插值及流量误差修正技术,进行了大流量安全阀特性试验数据采集及数据处理方法研究,重点阐述了容积法测流量计算中时间间隔的选取、流量修正和特性曲线分析方法。实现了大流量安全阀公称流量的精确测量,系统误差小于1%,满足MT 419和GB/T 25974.3标准中的要求。 In order to solve the key technical problems of data acquisition and data processing in the test of nominal flow characteristics of large flow safety valve, the data acquisition of large flow safety valve characteristic test was carried out by using synchronous sampling system, digital filtering technology, cubic spline interpolation and flow error correction technology And data processing methods, focusing on the volumetric method of flow measurement calculation of the time interval selection, flow correction and characteristic curve analysis. The accurate measurement of the nominal flow of the large flow safety valve is achieved with a system error of less than 1%, meeting the requirements of the standard MT 419 and GB / T 25974.3.