1 Scope 1.1 This standard covers metal ball valves used in on-off service that have butt-welding or flanged ends for nominal pipe size 1/2 through NPS 12 and threaded or socket-welding ends for sizes NPS 1/2 through NPS 2, corresponding to the nominal pipe sizes in ASME B36.10M. 1.2 This standard covers additional requirements for ball valves that are otherwise in full conformance to the requirements of ASME B16.34, Standard Class. 1.3 This standard covers flanged and butt-welding end valves in Standard Classes 150 and 300 and threaded and socket-welding end valves in Standard Classes 150, 300, and 600. 1.4 The nomenclature for valve parts for floating ball valves is shown in Figure 1; nomenclature for trunnion-mounted ball valves is shown in Figure 2. The configurations in Figures 1 and 2 are intended to illustrate basic valve parts. Other configurations may be used to meet the requirements of this standard.