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About This Item


Full Description

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 flanged-end, single-flange (lug-type), and flangeless (wafer-type) 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.


Document History

  1. MSS SP-67-2022


    Butterfly Valves

    • Most Recent
  2. MSS SP-67-2017

    Butterfly Valves, Includes Errata (2017)

    • Historical Version
  3. MSS SP-67-2011

    Butterfly Valves

    • Historical Version
  4. MSS SP-67-2002a

    Butterfly Valves

    • Historical Version
  5. MSS SP-67-2002

    Butterfly Valves

    • Historical Version
  6. MSS SP-67-1995

    Butterfly Valves

    • Historical Version