以下为句子列表：
英文: This valve is a combined regulating and flow measurement device and must be installed with five diameters of straight pipe of the same nominal diameter as the valve and without intrusions upstream of the valve.
中文: 这种阀门是一种调节和流量测量的组合装置，必须安装在与阀门公称通径一致的直线管路，长度为五倍直径的位置，使得阀门上游不会受到侵扰。
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