NEN EN 13953 : 2015

Foreword
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
   3.1 Terms and definitions
   3.2 Abbreviations
4 Operating temperatures
5 Materials
   5.1 General
   5.2 Metallic materials
   5.3 Non-metallic components
   5.4 Lubricants, sealants and adhesives
6 Design
   6.1 General
   6.2 Threads
   6.3 Springs
   6.4 Test requirements
7 Testing and inspection of the design
   7.1 General
   7.2 Hydraulic proof test
   7.3 Start to discharge and discharge capacity test
   7.4 Leak test
   7.5 Test records
   7.6 Design changes
8 Production testing
9 Marking
10 Documentation
Annex A (informative) Terms used with pressure relief valves
Annex B (normative) Special low temperature requirements for
        valves
Annex C (informative) Sizing of pressure relief valves for
        LPG cylinders
Annex D (informative) Production testing
        D.1 General
        D.2 Dimensional inspection
        D.3 Setting and leak testing of pressure relief valves
Bibliography

Defines the design, testing and marking requirements for spring loaded pressure relief valves (PRV), for use in liquefied petroleum gas (LPG) cylinders.