API STD 609-2009 PDF

Scope: 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.

API STD 609-2009 history

1970 API STD 609-2021
2016 API STD 609-2016 Butterfly Valves: Double-flanged@ Lug-and Wafer-type (Eighth Edition)
2009 API STD 609-2009 Butterfly Valves: Double-flanged@ Lug- and Wafer-type (Seventh Edition)
2004 API STD 609-2004 Butterfly Valves: Double Flanged@ Lug- and Wafer-Type (Sixth Edition)
1997 API STD 609-1997 Butterfly Valves: Double Flanged@ Lug- and Wafer-Type (Fifth Edition)
1991 API STD 609-1991 Lug- and Wafer-Type Butterfly Valves (Fourth Edition)