NEN EN 1074-2 : 2000 AMD 1 2004

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Design requirements
5 Performance requirements
      5.1 Mechanical strength
             5.1.1 Resistance to internal pressure of the
                      shell and of all pressure containing
                      components
             5.1.2 Resistance of the obturator to
                      differential pressure
             5.1.3 Resistance to the valve to bending
             5.1.4 Resistance of valves to operating loads
      5.2 Leak-tightness
             5.2.1 Leak-tightness of the shell and of all
                      pressure containing components
             5.2.2 Seat tightness
             5.2.3 Maximum operating torque (MOT) for
                      operation and leak-tightness
             5.2.4 Leak-tightness of gearboxes to external
                      pressure
      5.3 Hydraulic 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 of valves
                    to operating loads (see 5.1.4)
Annex B (normative) Torque requirements for gate valves to be
                    operated by ring key and bar (see 5.2.3
                    and Annex A)
Annex C (normative) Test method for the operation of valves
                    (see 5.2.3)
Annex D (normative) Test method for the endurance of valves
                    (see 5.5)

Defines the minimum fitness for purpose requirements for isolating valves to be connected to, or used in water supply systems, either above or below ground, carrying water for human consumption. Establishes design and performance requirements, and the conformity assessment procedure for isolating valves, whatever their type and materials.