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API STD 609 (Complete Document)
Revision / Edition: 7    Chg:    Date: 10/00/09   Abbreviations Definitions
Active, Most Current Item is contained in these sets
BUTTERFLY VALVES: DOUBLE-FLANGED, LUG- AND WAFER-TYPE
Additional Comments:C60907
Published By:American Petroleum Institute (API)
Page Count:32
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Referenced Items
ANSI B16.20
ANSI B16.5
API STD 598
API STD 607
ASME B1.1
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API STD 653, 5th Edition IHS Petrochemical Collection IHS Standards Expert
Description / Abstract Back to Top
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 that provide tight shutoff in the closed position. The following two categories of butterfly valves are included.

a) 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 48 for valves having ASME Class 125 or Class 150 flange bolting patterns.

b) Category B—ASME Class and pressure-temperature rated butterfly valves that have an offset seat and either an eccentric or a concentric disc configuration. These valves may have a seat rating less than the body rating. For lug and wafer, Class 150, 300, and 600, sizes covered are NPS 3 to NPS 24. For double-flanged long pattern, Class 150, 300, and 600, sizes covered are NPS 3 to NPS 36. For double-flanged short pattern, Class 150 and 300, sizes covered are NPS 3 to NPS 48. For double-flanged short pattern, Class 600, sizes covered are NPS 3 to NPS 24.

Valve configurations include double-flanged, lug- and wafer-types with facings that permit installation between ASME and MSS flanges that conform to the standards and specifications listed in Section 2.
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