Foreword
1. Scope
2. Normative references
3. Terms and definitions
4. Requirements
   4.1 Design
       4.1.1 Materials
       4.1.2 Pressure/temperature ratings
       4.1.3 Dimensions
       4.1.4 Operation
       4.1.5 Construction
   4.2 Functional characteristics
       4.2.1 Shell design strength
       4.2.2 Seat leakage
       4.2.3 Operating element
5. Test methods
6. Inspection
7. Designation
8. Marking, preparation for storage and transportation
   8.1 Marking
       8.1.1 General
       8.1.2 Additional markings
   8.2 Preparation for storage and transportation
       8.2.1 Corrosion
       8.2.2 Ends
Annex A (normative) Cast iron and copper alloy shell
         materials
Annex B (informative) Information to be supplied by the
         purchaser
Annex ZA (informative) Clauses of this European Standard
         addressing essential requirements or other
         provisions of EU Directives