Gray Iron Swing Check Valves, Flanged and Threaded Ends
This 2005 edition of MSS SP-71 added minimum wall requirements that were previously omitted. The addition of the minimum wall thickness requirements are necessary to qualify the valves for Class 125 and Class 250 pressure-temperature designation/rating as defined in ASME B16.1 and Table 1 of this MSS Standard Practice. This edition also deleted the PN designations, which were easily confused with designations in international standards that are based on other material specifications and pressure-temperature rating procedures. ISO references were deleted from Annex C.
|* Archived Standard Practices receive a 40% discount and Withdrawn Standards sell for $60.|