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Butterfly Valves

This Standard Practice covers dimensions, design, testing, and marking requirements for butterfly valves. Further reference should be made to MSS SP-68.
This Standard Practice covers two types of butterfly valves:
Type I - Valves for tight shut-off (tested per subsection 10.2.1).
Type II- Valves permitting seat leakage (see subsection 10:2.2).
This Standard Practice covers flangeless (wafer-type), single flange (lug-type), and flanged end valves in sizes 1 1/2 NPS thru 72 NPS, grooved end valves, and shouldered end valves with pressure ratings in accordance with the requirements of Sections 3 and 4.


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July 12, 2020

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