NEN EN 14129 : 2014

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Operating conditions
5 Materials
  5.1 General
  5.2 Metallic materials
  5.3 Non-metallic components
  5.4 Lubricants, sealants, and adhesives
  5.5 Certification
6 Design
  6.1 Introduction
  6.2 Design parameters
  6.3 Threads
  6.4 Springs
  6.5 Other requirements
  6.6 Pressure relief valve with parallel thread
7 Testing of the design
  7.1 General
  7.2 Hydraulic proof test
  7.3 Overtorquing test
  7.4 Operating and flow characteristics
      7.4.1 General
      7.4.2 Operation test
      7.4.3 Flow characteristics test
      7.4.4 Reseal pressure
      7.4.5 Blowdown
8 Marking
  8.1 Pressure relief valves
  8.2 Thermal expansion valves
9 Operating instructions
Annex A (Informative) Terms used with LPG pressure relief
                       valves
Annex B (Normative) Special low temperature requirements
                       for valves
Annex ZA (informative) Relationship between this European
                       Standard and the Essential
                       Requirements of EU Directive 97/23/EC
Bibliography

Defines the requirements for the design and testing of spring loaded pressure relief valves and thermal expansion valves for use in: - static LPG pressure vessels; - LPG pressure vessels on road tankers, rail tankers, tank-containers or demountable tanks.