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)
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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