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FOREWORD
INTRODUCTION
1 Scope and limitations
2 Normative references
3 Definitions
4 Symbols
5 Valves with standard trim
  5.1 Pressures and pressure ratios
  5.2 Regime definition
  5.3 Preliminary calculations
  5.4 Regime I (subsonic flow)
  5.5 Regimes II to V (common calculations)
  5.6 Noise calculations
  5.7 Calculation flow chart
6 Valves with special trim design
  6.1 Introduction
  6.2 Single stage, multiple flow passage trim
  6.3 Single flow path, multistage pressure
      reduction trim (two or more throttling steps)
  6.4 Multipath, multistage trim (two or more
      passages and two or more stages)
7 Valves with higher outlet Mach numbers
  7.1 Introduction
  7.2 Calculation procedure
8 Valves with experimentally determined
  acoustical efficiency factors
9 Combination of noise produced by a control
  valve with downstream installed two or more
  fixed area stages
Annex A (informative) - Calculation examples
Bibliography

BS EN 60534-8-3