DIN EN 60534-2-1:2012-01
Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions (IEC 60534-2-1:2011); German version EN 60534-2-1:2011 / Note: DIN EN 60534-2-1 (2000-03) and DIN EN 60534-2-1 Berichtigung 1 (2003...