API 600 Steel Valves - Flanged & Buttwelding Ends
API 600 is the main steel gate valve specifi cation. Valve design and construction criteria are specified,
as well as materials and trim designations. An appendix covers information pertaining to pressure seal
valves. ISO Standard 10434 is essentially the same as API 600, re-produced in the ISO format.
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 specifi cation. Valve design and construction
criteria are specifi ed, as well as materials and trim designations. This standard includes requirements for
bellows 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 Buttwelding Ends
Typically used for fl oating ball valves, API 608 is the purchase specifi cation 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 500 NB (20”).
API 609 Butterfl y Valves - Lug-Type and Wafer-Type
API 609 is a specifi cation for butterfl y valves with lug-type and wafer-type confi gurations designed for
installation between ANSI B16 fl anges, 150 to 1500 class.
API 598 Valve Inspection & Testing
API 598 covers the testing and inspection requirements for check, gate, globe, ball, plug & butterfl y
valves. Steel valve pressure ratings in ASME/ANSI B16.34 are required to determine API 598 test
pressure for steel valves.
API 6D Specifi cation for Pipeline Valves - Gate, Plug, Ball and Check Valves
Specifi cation 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
refi nery and petrochemical purchasers will reference the more stringent testing requirements of API 6D,
602, 609 or BS 1868, 1873 is specifi ed upstream. Similarly ball valves manufactured to API 608 may be
specifi ed as tested to API 6D.
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 specifi cation 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 valves) & API 602 (forged valves) for
class 150, 300 and 600.
ASME/ANSI B16.10 Face-to-Face Dimensions of Ferrous Valves
B16.10 specifi es the face-to-face dimensions of all fl anged and buttweld end valves. Screwed and
socketweld end valve face-to-face dimensions are not included in this standard.
MSS SP-55 Quality Standard for Steel Castings for Valves, Flanges and Fittings and other Piping Components
MSS SP-55 outlines the visual inspection criteria for castings (& forgings). This specifi cation is listed as
part of the procedure under API 598.
NACE MR-0175 Standard for Sour Service
Standard material requirements for sulfi de stress cracking resistant metallic materials for oilfield
equipment MR-0175 is the ‘standard’ for materials used in ‘sour’ environments such as found in piping
systems in many refi neries. It lists materials, mechanical properties and heat treatments for metals used
in hydrogen sulfi de bearing hydrocarbon service.
BS 1873 Specification for Steel Globe Valves
BS 1873 outlines specifi cations for fl anged and buttweld end globe and stop check valves for petroleum
petrochemical and allied industries. Valves made to BS 1873 usually dual conform to ANSI B16.34 wall
thickness and other design criteria. There is no API standard for globe valves, however API 600, API
603 or ANSI B16.34 are often specifi ed for wall thickness requirements. In addition API 600 stuffi ng box
dimensions are often specified.
BS 1868 Specifi cation for Steel Check Valves
BS 1868 outlines specifi cations for fl anged and buttweld end check valves for the petroleum
petrochemical and allied industries. Valves made to BS 1868 usually dual conform to ANSI B16.34 wall
thickness and other design criteria. There is no API standard for upstream & refi nery check valves only
API 6D ‘pipeline’ check valves, however API 600, API 603 or ANSI B16.34 are often specifi ed for wall
thickness requirements.
ANSI/ASME STEEL GATE, GLOBE & CHECK VALVES
Cast Gate Valves - API 600
For users of cast gate valves, API 600 is the key document. It details all design material criteria. API
600 also lists important dimensions such as stem diameter minimums, wall thickness and stuffing box
size. Cast, globe and check valves can also reference this standard for wall thickness and other design
criteria. Another important gate valve standard is ASME B16.34. This standard outlines requirements
on valves constructed to ASME boiler code pressure temperature ratings. One important area in which
API 600 differs from ANSI B16.34 is minimum wall thickness. API 600 requires a heavier wall for a given
pressure rating than does ASME B16.34. API 603 is optionally used for 150# and 300# stainless steel
valves and allows a lighter wall thickness than API 600.
Cast Check Valves
Check valves can be manufactured to API 6D (full opening pipeline check valves), BS 1868 or ANSI
B16.34/API 600. Valves manufactured to BS 1868 stocked by Global Supply Line also conform to ANSI
B16.34 wall thickness and other design criteria.
Cast Globe Valves
Globe Valves can be manufactured to BS 1873 or ANSI B16.34/API 600. Valves manufactured to BS
1873 stocked by Global Supply Line also dual conforms to ANSI B16.34 wall thickness and other design
criteria.
Forged Gate, Globe & Check Valves
Small forged carbon steel gate, globe & check valves in 150#, 300#, 600#, 800# & 1500# class valves
are covered by API 602. ANSI 150 to 2500 forged, check and globe valves can also be manufactured to
BS 5352. Forged check, gate & globe valves in 2500# are also manufactured to ANSI B16.34. API 602
specifi cation covers the same details for small forged valves that API 600 does for larger valves. API 602
also required a heavier wall for 150#, 300# & 600# classes than does B16.34.