BS ISO 9644:2018
$142.49
Agricultural irrigation equipment. Pressure losses in irrigation valves. Test method
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 26 |
This document applies to manually-activated valves only.
This document specifies a test method for determining the pressure loss in agricultural irrigation valves under steady-state conditions when water flows through them. The scope and accuracy of the valve performance specifications presented will assist agricultural irrigation system designers in comparing pressure losses through various types of valves.
The measurement of pressure losses provides a means for determining the relationship between pressure loss and flow rate through the valve.
This document also describes the method of reporting pertinent test data.
No attempt is made to define product use, design or applications.
The test method is suitable for valves with equal inlet and outlet nominal sizes.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 6 | Foreword |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions |
| 8 | 4 Test installation 4.1 Permissible deviation of measuring devices |
| 9 | 4.2 Test equipment 4.2.1 Piping 4.2.2 Throttling valve 4.2.3 Flow measuring device 4.2.4 Pressure differential measuring device 4.2.5 Pressure taps |
| 11 | 4.2.6 Temperature sensors 4.2.7 Filtration 5 Test procedure 5.1 Test installation 5.2 Test conditions 5.2.1 Permissible fluctuations in measurements |
| 12 | 5.2.2 Steady conditions 5.2.3 Unsteady conditions 5.3 Test bench pressure loss |
| 13 | 5.4 Test of valve 6 Test results 6.1 Presentation of test results |
| 14 | 6.2 Calculated valve coefficients 6.2.1 General 6.2.2 Flow resistance coefficient, ζ 6.2.3 Valve flow coefficient, Kv |
| 15 | 6.3 Test report |
| 16 | Annex A (informative) Measurement uncertainty |
| 20 | Annex B (informative) Evaluation of uncertainty of flow rate coefficient, Kv, and pressure losses coefficient, ζ |
| 25 | Bibliography |
