MSS Banner The Technical Voice of the Industry
View Larger Image


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 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.


Today is: Sunday
July 12, 2020

MSS Member Login

MSS Scholarships
(Now Accepting 2020 Applications)
Deadline Extended

MSS Apparel

We Accept:
VISA  MasterCard  American Express
Discover  Diners Club 
Site Secured by:

Like us on:

Accept Credit Cards Online