What does SW stand for?

MLA style: "SW." Acronym Finder . 2012. AcronymFinder.com 2 Jun. 2012 http://www.acronymfinder.com/Socket-Weld-(piping-joint)-(SW).html
Chicago style: Acronym Finder . S.v. "SW." Retrieved June 2 2012 from http://www.acronymfinder.com/Socket-Weld-(piping-joint)-(SW).html
APA style: SW. (n.d.) Acronym Finder. (2012). Retrieved June 2 2012 from http://www.acronymfinder.com/Socket-Weld-(piping-joint)-(SW).html

Socket Weld (piping joint)

This definition appears very rarely and is found in the following Acronym Finder categories:

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Samples in periodicals archive:

As a special added feature, full port valves are also available with socket weld or butt weld end connections on sizes 1/4" to 4".