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MSS SP 67

2017 Edition, 2017

Complete Document

Butterfly Valves

Includes all amendments and changes through Errata , 2017


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Description / Abstract:

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 1½ 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.