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SP-68-1997 (R 2004)
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SP-68-1997 (R 2004)

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/ANSI B16.5 flanges for sizes NPS 3 (DN 80) through NPS 24 (DN 600) and ASME/ANSI 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/ANSI B16.34.
Definitions may be found in MSS SP 96.


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