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API Std 609

Butterfly Valves: Double-flanged, Lug- and Wafer-type, Seventh Edition
standard by American Petroleum Institute, 10/01/2009

API Spec 19G2

Flow-control devices for side-pocket mandrels, First Edition (ISO 17078-2:2007 Modification), Includes Addendum 1 (2019)
standard by American Petroleum Institute, 06/01/2010

API Spec 11E

Specifications for Pumping Units, Eighteenth Edition, Includes Errata (2009)
standard by American Petroleum Institute, 11/01/2008

API Std 608

Metal Ball Valves-Flanged, Threaded and Welding Ends, Fifth Edition
standard by American Petroleum Institute, 11/01/2012