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Valves for water supply. Fitness for purpose requirements and appropriate verification tests - Isolating valves Ingestion-build-205840 BS EN 60264-3-4 specifies the1 Scope This European Standard defines the minimum fitness for purpose requirements for isolating valves to be used in, or connected to, water supply pipe systems, above or below ground (see EN 805), carrying water intended for human consumption. This standard specifies the design requirements, the performance requirements, and the conformity assessment method for isolating valves, whatever their type and materials. This standard applies in priority