BS ISO 7714:2018
$102.76
Agricultural irrigation equipment. Volumetric valves. General requirements and test methods
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 20 |
This document specifies general requirements and test methods for volumetric valves able to automatically deliver preset quantities of water. It is applicable to valves actuated by pipeline pressure and flow alone, and which do not need any other, external, source of energy.
NOTE Volumetric valves are typically required to operate correctly with different qualities of irrigation water at a variety of flow rates and at temperatures between 5 °C and 50 °C.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | Foreword |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions |
| 9 | 4 Classification 4.1 According to accuracy of cumulative volume counter 4.2 According to method of operation as a system of volumetric valves |
| 10 | 5 Markings 6 Technical requirements 6.1 General 6.2 Threaded and flanged connections |
| 11 | 6.3 Metrological requirements 6.3.1 General 6.3.2 Class 1, Class 2 and Class 3 — Sizes DN16, DN20 and DN25 6.3.3 Class 1 and Class 2 — Sizes DN40 to DN300 |
| 12 | 6.3.4 Overload flow rate (qV4) 7 Mechanical, functional and accuracy tests 7.1 General 7.2 Accuracy of measuring devices 7.3 Sampling and minimum acceptance requirements 7.3.1 Pattern approval tests |
| 13 | 7.3.2 Thermal preconditioning 7.4 Test of resistance to hydrostatic pressure 7.5 Test of manual opening and closing 7.5.1 Non-serial volumetric valves 7.5.2 Serial volumetric valves (single outlet, single outlet “skip over”, and dual outlet) |
| 14 | 7.6 Tests of accuracy 7.6.1 General 7.6.2 Flow rates and maximum permissible error for accuracy tests |
| 15 | 7.7 Pressure loss 7.7.1 Requirement 7.7.2 Test procedure 7.8 Endurance tests 7.8.1 Endurance flow conditioning 7.8.2 Accuracy tests after endurance conditioning |
| 16 | 7.8.3 Endurance of operating mechanism 8 Information to be supplied by the manufacturer |
| 18 | Annex A (informative) Quality of irrigation water |
| 19 | Bibliography |
