EN 1267:2012

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Test facility
5 Test procedure
6 Calculation
7 Test report
Annex A (informative) - Lower zeta limit
        considerations
Annex B (informative) - Flow rate and
        physical phenomena of flow
        through a valve
Annex C (informative) - Uncertainty on
        measurement
Annex D (informative) - Evaluation of
        uncertainty of flow rate
        coefficient (K[v]) and pressure
        losses coefficient (zeta)
Bibliography

This European Standard specifies a method for determining valve pressure loss coefficient and fluid flow coefficient using water as test fluid. This method is suitablefor valves with low zeta values but higher than 0,1 by determining pressure loss, with respect to fluid flow rate and specific gravity, andfor valves with equal inlet and outlet nominal size.Industrial process control valves are excluded from this European Standard.NOTE 1For zeta values above 6, the pressure loss coefficient inaccuracy is higher than the pressure loss caused by the test tubes. It becomes the same configuration of tests as in EN 60534-2-3.NOTE 2If using air as test fluid, other standards e.g. EN 60534-2-3 and ISO 6358 should be referred to.