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MSS SP-68-2017 High Pressure Butterfly Valves with Offset Design
standard by Manufacturers Standardization Society, 05/01/2017
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SCOPE1.1 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.
1.4 Definitions may be found in MSS SP-96