Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Design and specification
4.1 General
4.2 Materials
4.2.1 General
4.2.2 Operating temperatures
4.2.3 Copper alloys
4.2.4 Non-metallic materials
4.3 Essential components
4.3.1 Valve operating mechanism
4.3.2 Valve body
4.3.3 Sealing mechanism
4.3.4 Valve stem
4.3.5 Valve outlet
4.4 Optional components
4.4.1 General
4.4.2 Pressure relief valve
4.4.3 Education tube
4.4.4 Excess flow device
4.4.5 Non-return valve
4.4.6 Sediment tube
4.5 Valve connections
4.6 Leak tightness
4.7 Operating torque
5 Valve type test
5.1 General
5.2 Test valves
5.3 Test procedure
5.3.1 Hydraulic pressure test
5.3.2 Valve closure test
5.3.3 External and internal tightness test
5.3.4 Endurance test
5.3.5 Resistance to excessive closing and opening
torque test
5.3.6 Hand wheel fire exposure test
5.3.7 Impact test
5.3.8 Valve stem test
5.4 Acceptance criteria
6 Markings
Annex A (normative) Valve dimensions
Annex B (normative) Valve for non-domestic cylinders up to
and including 7.5 litre water capacity
Annex C (informative) Production testing and inspection
Annex D (normative) Special low temperature requirements
for valves
Bibliography