Valve Standard Specifications: API, ANSI, ASME, BS

Design Standard:

API 600 Steel Valves – Flanged & Buttwelding End

API 600 is the main steel gate valve specification. Valve design and construction criteria are specified, as well as materials and trim designations.Anappendix covers information pertaining to pressure seal valves. ISO Standard 10434 is essentially the same as API 600, re-produced in the ISOformat.

API 6D Specification for Pipeline Valves – Gate, Plug, Ball and Check Valves

Specification for pipeline valves (gate, ball, plug, and check valves) API 6D is the primary standard for valves used in main line pipeline service, including gate, ball, plug and check valves.Occasionally refinery and petrochemical purchasers will reference the more stringent testing requirements of API 6D,602, 609 or BS 1868, 1873 is specified upstream. Similarly ball valves manufactured to API 608 may be specified as tested to API 6D.

API 602 Compact Steel Gate Valves – Flanged, Threaded, Welding and Extended-Body Ends

API 602 is for 100 NB (4”) & smaller forged steel gates valve specification. Valve design and construction criteria are specified, as well as materials and trim designations. This standard includes requirements forbellows seal gate valves. In 150, 300 and 600 class API 602 requires a heavier wall than ANSI B16.34

API 603 Cast, Corrosion – Resistant, Flanged-End Gate Valves

API 603 covers light walled gate valves in sizes NPS 15mm to 600mm (1/2” through 24”), in classes 150,300&600.These valves are used in applications where a thicker API 600 casting is not needed. However, the wall thickness normally conforms to ANSI B16.34 wall.

API 608  Steel Ball Valves – Flanged and ButtweldingEnds

Typically used for floating ball valves, API 608 is the purchase specification for class 150, 300, 600 and 800 class steel ball valves. Valves design and construction criteria are detailed. Trunnion mounted pipeline ball valves are manufactured to API 6D but API 608 is also allowable up to 500NB(20”).

API 609 Butterfly Valves – Lug-Type and Wafer-Type

API 609 is a specification for butterfly valves with lug-type and wafer-type configurations designed for installation between ANSI B16 flanges, 150 to 1500 class.

ASME/ANSI B16.34 Steel Valves – Flanged & Buttwelding Ends

ASME B16.34 is the standard in which steel valve pressure/temperature ratings are specified. It also offers additional valve specification data including non-destructive examination procedures for upgrading valves for special class service. Gate valves manufactured under B16.34 wall thickness minimums may not meet the minimum wall thickness required of API 600 (cast steel valves) & API 602 (forged valves) for class 150, 300 and 600.

Face-to-Face Dimensions Standard:

ASME/ANSI B16.10 Face-to-Face Dimensions of Ferrous Valves

ASME B16.10 specifies the face-to-face dimensions of all flanged and buttweld end valves. Screwed and socket weld end valve face-to-face dimensions are not included in this standard.

End Dimensions Standard:

ASME B16.5 Pipe flanges and flanged fittings

NPS 1/2 through NPS 24 Metric/Inch Standard

ASME B16.47

Large Diameter Steel Flanges

NPS 26 Through NPS 60

ASME B16.25 Butt Welding Ends

ASME B16.11 Forged Fittings, Socket Welding, and Threaded

Test Standard:

API 598 Valve Inspection & Testing

API 598 covers the testing and inspection requirements for check, gate, globe, ball, plug & butterfly valves. Steel valve pressure ratings in ASME/ANSI B16.34 are required to determine API 598 test pressure for steel valves.

BS EN 1266 Industrial Valve- Testing of Metallic Valves

Part 1 Pressure tests, test procedures and acceptance of creteria-mandatory reuirement

ISO 5208 Valve Test Standard

Incorporates an adoption of API 6D test standard. Leakage rate A is specified for soft seated valves and plug valves (zero leakage*). Also includes standards for gate, globe and check valves.

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