1、Metal Ball ValvesFlanged, Threaded, and Welding EndsAPI STANDARD 608 FIFTH EDITION, NOVEMBER 2012Metal Ball ValvesFlanged, Threaded, and Welding EndsDownstream SegmentAPI STANDARD 608 FIFTH EDITION, NOVEMBER 2012Special NotesAPI publications necessarily address problems of a general nature. With res
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15、cycle. Status of the publication can be ascertained from the API Standards Department, telephone (202) 682-8000. A catalog of API publications and materials is published annually by API, 1220 L Street, NW, Washington, DC 20005.Suggested revisions are invited and should be submitted to the Standards
16、Department, API, 1220 L Street, NW, Washington, DC 20005, standardsapi.org.iiiContentsPage1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Normative References. . . . . . . .
17、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Terms and Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Pressure-Tem
18、perature Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.1 Valve Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19、 . . . . . 34.2 Shell Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.3 Seat and Seal Rating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20、. . . . . . . . . . . . . . . . . . . . . . . . 35 Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.2 Flow Passageway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.3 Body . . . . . . . . . . . . . . .
22、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.4 Antistatic Design (Electrical Continuity Between Ball-Stem-Body) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.5 Ball-Stem Design and Const
23、ruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.6 Ball Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.7 Packi
24、ng Glands and Gland Bolting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.8 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、 . . . . . . . . 75.9 End Flange Face Interruptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75.10 Valve Shell Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26、. . . . . . . . . . . . . . . . . . . . . . 86 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86.1 Shell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86.2 Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.3 Bolting. . . . . . . .
28、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.4 Stem Seals, Body Seals, and Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
29、6.5 Identification Plate(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.6 Threaded Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30、. . . . . . . . . . . . . . . . . 97 Inspection, Examination, and Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97.1 Inspection and Examination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31、. . . . . . . . . . . . . . . . . . . . . . 97.2 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97.3 Pressure Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97.4 Fire Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 Marking . . . . . . . . . . . . . . . . .
33、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 Packaging and Shipping Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1010 Spare Parts . . . . .
34、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Annex A (informative) Information to Be Specified by the Purchaser. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Annex B (informati
35、ve) Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Figures1 Flange Face Interruption Limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36、. . . . 82 Typical Fire-resistant Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 Typical Unidirectional Valve Identification Plate Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
37、 . . 12B.1 Typical Floating Ball Valve Components (One-piece Body/Unibody Illustrated)Nomenclature. . . . . . 14B.2 Typical Trunnion-mounted Ball Valve Components (Split-body Valve Illustrated)Nomenclature . . . . 15vContentsPageTables1 Minimum Seat Pressure-Temperature Ratingbar. . . . . . . . . .
38、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Minimum Seat Pressure-Temperature Ratingpsig. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Cylinder Diameter for Categorizing Bore Size . . . . . . . . . . . . . . . . . . . . . . . .
39、 . . . . . . . . . . . . . . . . . . . . . . . . . 4IntroductionThe purpose of this API standard is to establish additional design, operational, and performance requirements required by petroleum refining, petrochemical processing, and chemical processing end users that are in addition to and beyond
40、 the requirements established by ASME B16.34, ValvesFlanged, Threaded, and Welding End.API 608 is intended to provide the similar additional requirements for steel and alloy steel ball valves beyond ASME B16.34 as do the following API standards for other valve types: API Standard 594, Check Valves:
41、Flanged, Lug, Wafer and Butt-welding; API Standard 599, Metal Plug ValvesFlanged, Threaded, and Welding Ends; API Standard 600, Steel Gate Valves: Flanged and Butt-Welding Ends, Bolted Bonnets; API Standard 602, Steel Gate, Globe, and Check Valves for Sizes DN 100 and Smaller for the Petroleum and N
42、atural Gas Industries; API Standard 603, Corrosion-resistant, Bolted Bonnet Gate ValvesFlanged and Butt-welding Ends; API Standard 609, Butterfly Valves: Double-flanged, Lug- and Wafer-type.vi1Metal Ball ValvesFlanged, Threaded, and Welding Ends1 Scope1.1 This standard specifies the requirements for
43、 metal ball valves suitable for petroleum, petrochemical, and industrial applications that have: flanged ends in sizes DN 15 through DN 600 (NPS 1/2 through NPS 24); butt-welding ends in sizes DN 15 through DN 600 (NPS 1/2 through NPS 24); socket-welding ends in sizes DN 8 through DN 50 (NPS 1/4 thr
44、ough NPS 2); threaded ends in sizes DN 8 through DN 50 (NPS 1/4 through NPS 2).Corresponding to the nominal pipe sizes in ASME B36.10M.1.2 This standard applies to metal ball valves with pressure classes as follows: flanged ends in Classes 150, 300, and 600; butt-welding ends in Classes 150, 300, an
45、d 600; socket-welding ends in Classes 150, 300, 600, and 800; threaded ends in Classes 150, 300, 600, and 800.1.3 This standard establishes requirements for bore sizes described as: full bore; single reduced bore; double reduced bore.1.4 This standard applies to floating (seat-supported) ball (Figur
46、e B.1) and trunnion ball valve designs (Figure B.2). These figures are to be used only for the purpose of establishing standard nomenclature for valve componentsother floating and trunnion designs also exist.1.5 This standard establishes additional requirements for ball valves that are otherwise in
47、full conformance to the requirements of ASME B16.34, Standard Class.2 Normative ReferencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced docu
48、ment (including any amendments) applies.API Standard 598, Valve Inspection and TestingAPI Standard 607, Fire Test for Quarter-turn Valves and Valves Equipped with Non-metallic SeatsASME B1.1 1, Unified Inch Screw Threads (UN and UNR Thread Form)2 API STANDARD 608ASME B1.20.1, Pipe Threads, General P
49、urpose (Inch)ASME B16.5, Pipe Flanges and Flanged Fittings NPS 1/2 Through 24 Metric/Inch StandardASME B16.10, Face-to-Face and End-to-End Dimensions of ValvesASME B16.11, Forged Fittings, Socket-welding and ThreadedASME B16.20, Metallic Gaskets for Pipe FlangesRing-joint, Spiral-wound, and Jacketed ASME B16.25, Buttwelding EndsASME B16.34, ValvesFlanged, Threaded, and Welding EndASME B18.2.2, Square and Hex Nuts (Inch Series)ASME B36.10M, Welded and Seamless Wrought Steel PipeNACE MR 01032 2, Materials Resistant to Sulfide Stress Cracking in Corrosive Petro
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