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MSS SP-68-2017

High Pressure Butterfly Valves with Offset Design


This Standard Practice covers design requirements, test performance, marking requirements, and nomenclature for butterfly valves designed for high pressure performance, having a seat plane offset from the plane of the stem centerline. 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 B16.47 Series A flanges for sizes NPS 30 (DN 750) through NPS 48 (DN 1200). Reference Tables 1 and 2. This Standard Practice covers valves having body pressure temperature ratings in accordance with ASME B16.34.


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Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. [mss]

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