API 609:2021 pdf download.Butterfly Valves: Double-flanged, Lug- and Wafer-type, and Butt-welding Ends. API 609 covers 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. […]

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