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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:

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

  1. API Std 609

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    viewing


    Butterfly Valves: Double-flanged, Lug- and Wafer-type, and Butt-welding Ends, Ninth Edition

    • Most Recent
  2. API Std 609


    Butterfly Valves: Double-flanged, Lug- and Wafer-type, Eighth Edition, Includes Errata (April 2017)

    • Historical Version
  3. API Std 609


    Butterfly Valves: Double-flanged, Lug- and Wafer-type, Seventh Edition

    • Historical Version
  4. API Std 609


    Butterfly Valves: Double Flanged, Lug- and Wafer-Type

    • Historical Version
  5. API 609


    Butterfly Valves: Lug- and Wafer-Type

    • Historical Version