Historical
MSS 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.
Content Provider
Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. [mss]