Specifies requirements for the material, design and performance of metal-bodied non-return valves (swing check and tilting disc types) for use in water supply and sewerage systems (swing check only) suitable for operation both in horizontal and vertical positions. Classification ranges from Class 16 to 35 valves in the size range DN 80 to DN 750 inclusive, with the maximum temperature of the medium flowing through the valve not exceeding 60 degrees Celsius.
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