09/30202711 DC : 0
Superseded
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BS EN 1267 - INDUSTRIAL VALVES - TEST OF FLOW RESISTANCE USING WATER AS TEST FLUID
Hardcopy , PDF
31-01-2012
English
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Test facility
4.1 General
4.2 Test tube lengths
4.3 Test tube sizes
4.3.1 Steel test tubes
4.3.2 Copper test tubes
4.4 Pressure tappings
4.5 Measurement devices
4.6 Test fluid
5 Test procedure
5.1 Test conditions
5.1.1 Permissible measurement fluctuations
5.1.2 Steady conditions
5.1.3 Permissible non-steady conditions
5.2 Pressure loss in test tubes
5.3 Valve test
6 Calculation
6.1 Valve pressure loss determination
6.2 Coefficient calculations
6.2.1 Flow coefficient, K[v]
6.2.2 Flow coefficient, C[v]
6.2.3 Flow resistance coefficient zeta
6.3 Uncertainty
6.3.1 Total measurement uncertainty
6.3.2 Flow coefficients, K[v] and C[v]
6.3.3 Pressure loss coefficient, zeta
7 Test report
Annex A (informative) - Lower zeta limit considerations
Annex B (informative) - Flow rate and physical phenomena
of flow through a valve
B.1 General
B.2 Normal flow conditions
B.3 Cavitation
B.4 Flashing (self-vaporizations)
Annex C (informative) - Uncertainty on measurement
C.1 Introduction
C.2 Permissible measurement fluctuations
C.2.1 General
C.2.2 Direct visual observation of signals
delivered by the systems
C.2.3 Automatic recording of signals delivered
by measurement systems
C.2.4 Automatic integration of signals
delivered by the measurement systems
C.3 Measured value stability on physical quantities
C.4 Determining flow rate and pressure loss
coefficients in turbulent rating condition
Bibliography
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