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MSS SP-67-2017

Butterfly Valves

This Standard Practice covers dimensions, design, testing, and marking requirements for butterfly valves. Further reference should be made to the MSS SP-68. This Standard Practice covers two types of butterfly valves: Type I - Valves for tight shut-off (Tested per Section 10.2.1); Type II - Valves permitting seat leakage (See Section 10.2.2).This Standard Practice covers flangeless (wafer-type), single-flange (lug-type), and flanged-end valves in size NPS 1╜ through NPS 72, along with grooved-end valves, and shouldered-end valves, with pressure ratings in accordance with the requirements of Sections 3 and 4.

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


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