API Std 609

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

American Petroleum Institute , 04/01/2021

Publisher: API

File Format: PDF

$58.00$117.00


API Std 609 Ninth Edition PDF

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;

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