This European Standard specifies requirements for diaphragm valves with metallic shell materials. The range of nominal sizes covered is : - for flanged valves : sizes 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, DN 250 and DN 300 ; - for screwed valves : sizes ¼, 3/8, ½, ¾, 1, 1¼, 1½, 2, 2½ and 3 ; - for weld end valves : sizes 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, DN 250 and DN 300. The range of PN and Class designations covered is : - PN 6, PN 10, PN 16 and PN 25 ; - Class 150.