DIN EN ISO 5167-2-2004
用插入圆截面管道中的压差装置测量流体流量.第2部分:节流孔板
Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 2: Orifice plates (ISO 5167-2:2003); German version EN ISO 5167-2:2003