Foreword
1 Scope
2 Normative references
3 Definitions
4 Classification
   4.1 Classes of valve
   4.2 Groups of valve
5 Units of measurement
   5.1 Dimensions
   5.2 Pressures
   5.3 Bending moments and torques
6 Construction requirements
   6.1 General
   6.2 Materials
   6.3 Gas connections
   6.4 Seals for glands for moving parts
   6.5 Pressure test points
   6.6 Strainers
   6.7 Pneumatic and hydraulic actuating mechanisms
   6.8 Electrical equipment
   6.9 Power-saving circuits
7 Performance requirements
   7.1 General
   7.2 Mounting position
   7.3 Closing function
   7.4 Closing force
   7.5 Delay time and opening time
   7.6 Closing time
   7.7 Leak-tightness
   7.8 Sealing force
   7.9 Torsion and bending
   7.10 Rated flow rate
   7.11 Closed position indicator switches
   7.12 Durability
8 Methods of test
   8.1 Test conditions
   8.2 Mounting position
   8.3 Closing function
   8.4 Closing force
   8.5 Delay time and opening time
   8.6 Closing time
   8.7 Leak-tightness
   8.8 Sealing force
   8.9 Torsion and bending
   8.10 Rated flow rate
   8.11 Closed position indicator switches
   8.12 Durability
   8.13 Electrical equipment tests
   8.14 Power-saving circuits
9 Marking, installation and operating instructions
   9.1 Marking
   9.2 Installation and operating instructions
   9.3 Warning notice
Annex A (informative) Use of ISO 7-1: 1994 and ISO 228-1:
        2000 threads for gas connections
Annex B (informative) Leak-tightness test - Volumetric
        method
Annex C (informative) Leak-tightness test - Pressure loss
        method
Annex D (normative) Conversion of pressure loss into
        leakage rate
Annex ZA (informative) Identification of clauses which
         meet the Essential Requirements of the Gas
         Appliance Directive (90/396/EEC)