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About This Item
Full Description
This standard 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.
The following two categories of butterfly valves are included.
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a) Category A--Manufacturer's rated cold workingpressure (CWP) butterfly valves, usually with aconcentric disc and seat configuration. Sizes coveredare NPS 2 to NPS 48 for valves having ASME Class125 or Class 150 flange bolting patterns.
- For lug and wafer, Class 150: NPS 3 to NPS 48.
- For lug and wafer, Class 300 and Class 600: NPS 3 to NPS 48.
- For double-flanged long pattern, Class 150, 300, and 600: NPS 3 to NPS 36.
- For double-flanged short pattern, Class 150 and Class 300: NPS 3 to NPS 48.
- For double-flanged short pattern, Class 600: NPS 3 to NPS 24.
b) Category B--ASME Class and pressure-temperaturerated butterfly valves that have an offset seat andeither an eccentric or a concentric disc configuration.These valves may have a seat rating less than thebody rating. Sizes covered are listed below.
Document History
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API Std 609
Butterfly Valves: Double-flanged, Lug- and Wafer-type, and Butt-welding Ends, Ninth Edition- Most Recent
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API Std 609
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Butterfly Valves: Double-flanged, Lug- and Wafer-type, Eighth Edition, Includes Errata (April 2017)- Historical Version
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API Std 609
Butterfly Valves: Double-flanged, Lug- and Wafer-type, Seventh Edition- Historical Version
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API Std 609
Butterfly Valves: Double Flanged, Lug- and Wafer-Type- Historical Version
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API 609
Butterfly Valves: Lug- and Wafer-Type- Historical Version