1.1.1 This Standard Practice covers round opening, full, regular and reduced port metal ball valves.1.1.2 End connections covered herein are threaded, socket-welding, solder joint, grooved and flared end in nominal pipe sizes ΒΌ through 4 inch.1.1.3 These valves are intended for on-off operation and should be used for modulating or throttling service only when recommended by the manufacturer.1.1.4 This Standard Practice covers ball valves of the following materials: Carbon Steel, Alloy Steels, Stainless Steels, Gray Cast Iron, Ductile Iron, Malleable Iron, Copper Alloy.