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About This Item
Full Description
The following two categories of butterfly valves are included:
Category A—Manufacturer's rated cold working pressure (CWP) butterfly valves, usually with a concentric disc and seat configuration. Sizes covered are NPS 2 to NPS 60 for valves having ASME Class 125 or Class 150 flange bolting patterns.
Category B—ASME class and pressure-temperature-rated butterfly valves that have an offset seat and either an eccentric or a concentric disc configuration. Sizes covered are listed below:
- for lug and wafer, Class 150 and 300: NPS 2 to NPS 60;
- for lug and wafer, Class 600: NPS 3 to NPS 60;
- for double-flanged short and long pattern, Class 150, 300, and 600: NPS 3 to NPS 60;
- for butt-welding ends, Class 150, 300 and 600: NPS 3 to 60;
Document History
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API Std 609
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Butterfly Valves: Double-flanged, Lug- and Wafer-type, and Butt-welding Ends, Ninth Edition- Most Recent
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API Std 609
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