1.1 This Standard Practice covers design requirements, test performance, marking requirements, andnomenclature for butterfly valves designed for high pressure performance, having a seat plane offsetfrom the plane of the stem centerline.
1.2 This Standard Practice covers flangeless (wafer-type) and single flanged (lug-type) body designs,compatible with ASME B16.5 flanges for sizes NPS 3 (DN 80) through NPS 24 (DN 600) and ASME B16.47Series A flanges for sizes NPS 30 (DN 750) through NPS 48 (DN 1200). Reference Tables 1 and 2.
1.3 This Standard Practice covers valves having body pressure temperature ratings in accordance withASME B16.34.