ADOPTED_FROM:EN 1267:1999 This standard specifies a method for determining the pressure loss and fluid flow rate through valves in piping systems using water as a test fluid. This method is suitable: - for valves with low values but higher than 0,1 by determining pressure loss, with respect to fluid flow rate and density; - and to valves with equal inlet and outlet nominal sizes. Industrial-process control valves are out of the scope. NOTE 1 If using air as a test fluid, other standards e. g. EN 60534-2-3 and ISO 6358 should be referred to. NOTE 2 For valves with flow resistance coeficient values lower than 0,1, the pressure loss through the valve is very low with respect to the pressure loss in the test tubes, and values cannot be determined with an acceptable measurement accuracy.
NS-EN 1267:1999 history
2012NS-EN 1267:2012 Industrial valves — Test of flow resistance using water as test fluid
2000NS-EN 1267:1999 Valves — Test of flow resistance using water as test fluid