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This European Standard specifies requirements and tests for diaphragm valves of thermoplastic materials for isolating and control service. This standard is applicable to hand or power operated valves to be installed in industrial pipe systems, irrespective of the field of application and the fluids to be conveyed. The range of DN is: DN 8, DN 10, DN 15, DN 20, DN 25, DN 32, DN 40, DN 50, DN 65, DN 80, DN 100, DN 125, DN 150, DN 200 and DN 250. The range of PN and Class is: PN 6, PN 10, PN 16 and Class 150. The requirements specified by this standard concern the design, functional characteristics and manufacture of diaphragm valves, their connection to the pipe system, the body materials and their pressure/temperature rating between - 40 °C up to + 120 °C, for a lifetime of 25 years.