NF C46-507*NF EN 60534-2-5:2004 Industrial-process control valves - Part 2-5 : flow capacity - Sizing equations for fluid flow through multistage control valves with interstage recovery
2004NF C46-507*NF EN 60534-2-5:2004 Industrial-process control valves - Part 2-5 : flow capacity - Sizing equations for fluid flow through multistage control valves with interstage recovery