Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Design requirements
      4.1 Materials
      4.2 DN
      4.3 Pressures
      4.4 Temperatures
      4.5 Design of the shell and obturator
      4.6 End types and interchangeability
      4.7 Operating direction
      4.8 Maximum water velocity
      4.9 All materials, including lubricants, in contact
             with water intended for human consumption
      4.10 Internal corrosion and ageing resistance
      4.11 External corrosion and ageing resistance
5 Performance requirements
      5.1 Mechanical strength
      5.2 Leak-tightness
      5.3 Hydraulic or airflow characteristics
      5.4 Resistance to disinfection products
      5.5 Endurance
6 Conformity assessment
      6.1 General
      6.2 Type tests
      6.3 Control of production process and quality system
7 Marking
8 Packaging
Annex A (normative) Test method for the resistance to
                    internal pressure of the shell and of all
                    pressure containing components (see 5.1.1)
Annex B (normative) Test methods for the resistance of the
                    obturator to differential pressure (see
                    5.1.2)
Annex C (normative) Test method for the resistance of valves
                    to bending (see 5.1.3)
Annex D (normative) Minimal test method for the leak-
                    tightness to external pressure of the
                    shell and all pressure containing
                    components (see 5.2.1.2)
Annex E (normative) Test method for the resistance to
                    disinfection products (see 5.4)