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