SN EN 849 : 1997 AMD 2 2001

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions and symbols
4 Valve requirements
5 Prototype valve test
6 Marking
7 Test report
Annex A (normative) Valve impact test
Annex B (informative) Example of test sequence
Annex C (normative) Endurance test
Figure 1 - External tightness
Figure 2 - Internal tightness
Figure 3 - Maximum dimensions for gas cylinder valves,
           protected by a cap
Figure 4 - Example of an ignition test installation
Figure 5 - Pressure cycle specification
Figure 6 - Example of acetylene flashback test apparatus
Figure A.1 - Impact test
Figure C.1 - Typical arrangement of computer controlled equipment
Figure C.2 - Diagram showing a typical cycle for endurance test
Table 1 - Sequence of tests (tightness, endurance and fire
          resistance) for type approval (no variants)
Table 2 - Test procedures for tightness tests
Table 3 - Test sequence

Defines the requirements for gas cylinder valves and the method of testing such valves, for type approval. Applies to valves to be fitted to gas cylinders, up to 150L water capacity, intended to convey compressed, liquefied or dissolved gases. Applies to valves operated by a hand wheel or a key. Does not apply to valves for breathing equipment, cryogenic equipment, fire extinguishers or liquefied petroleum gas (LPG)