BS EN 849:1997

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

Specifies requirements and methods of test for type approval of hand wheel or key operated valves for use on gas cylinders up to 150 l water capacity. It is not applicable to valves for use on breathing equipment, fire extingushers, cryogenic equipment or LPG equipment.