Standard 609 Butterfly valves: Double-flanged, lug- and wafer-type, and butt-welding ends
Publication Year
2026
Document Status
Current
Abstract
Design, materials, face-to-face dimensions, pressure-temperature ratings, and examination, inspection, and test requirements for gray iron, ductile iron, bronze, steel, nickel-based alloy, or special alloy butterfly valves.
Document History
Tenth edition, May 2026. Effective December 2026. Supersedes the ninth edition, April 2021.
Publisher Information
American Petroleum Institute
The API is a US trade association representing all aspects of the oil and natural gas industry, from large integrated companies to exploration and production, refining, marketing, pipeline and marine businesses, and service and supply firms.
