1、Check Valves: Flanged, Lug, Wafer, and Butt-weldingAPI STANDARD 594SEVENTH EDITION, SEPTEMBER 2010MONOGRAM EFFECTIVE DATE: MARCH 1, 2011Check Valves: Flanged, Lug, Wafer, and Butt-weldingDownstream SegmentAPI STANDARD 594SEVENTH EDITION, SEPTEMBER 2010MONOGRAM EFFECTIVE DATE: MARCH 1, 2011Special No
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18、ardsapi.org.iiiContentsPage1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Normative References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Terms and Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Pressure-temperature Ratings. . . . . . . . . . . . . . . . . . . . . . . .
20、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.1 Valve Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.2 Temperature Restrictions . . . . . . . . . . .
21、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.1 Body and Co
22、ver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.2 Plates and Disc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23、 . . . . . . . . . . 95.3 Seating Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.4 External Bolts and Threaded Holes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、 . . . . . . . . . . . . . . . . . . . . 105.5 Flow Indication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.6 Gasket Surface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106.1 Body and Cover . . . . . . . . . . . . . .
26、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106.2 Plate and Disc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106.3 Cover G
27、asket (Type B Valves) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106.4 Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28、 . . . . . . . . . 126.5 Internal Wetted Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126.6 Body Seat Rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29、. . . . . . . . . . . . . . . . . . . . . . . . . 126.7 Springs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136.8 Pipe Plugs (Pin Retainers) . . . . . . . . . . . . . . . . . . . . . .
30、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136.9 Nameplate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 Inspection, Examination, Testing, and Re
31、pair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137.1 Inspection and Examination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137.2 Pressure Tests . . . . . . . . . .
32、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137.3 Repair of Defects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
33、Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34、 . . . . . . . . . . . . . . . . . . 149.1 Coatings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149.2 Valve Openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149.3 Packaging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1410 Recommended Spare Parts . . . . . . . . . . . .
36、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Annex A (informative) Information to be Specified by the Purchaser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Annex B (informative) Standard Nomenclature for Valve Part
37、s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Figures1 Limitations for Flange Face Interruptions That Fall Within the Gasket Seating Area. . . . . . . . . . . . . . . . 11B.1 Typical Type A Single-plate Wafer Check Valve. . . . . . . . . . . . . . . . . . . . . .
38、. . . . . . . . . . . . . . . . . . . . . . . . 17B.2 Typical Type A Dual-plate Wafer Check Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18B.3 Typical Type A Dual-plate Lug Check Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39、. . . . . . . . . . . . . . . . . . . 19B.4 Typical Type A Dual-plate Double-flanged Check Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20B.5 Typical Type B Flanged Swing Check Valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
40、 . . . . . . . . . 21vContentsPageTables1 Minimum Body-wall Thickness by Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Minimum Body-wall Thickness by Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41、 . . . . . . . . . . . . . . . 63 Type A Valve Face-to-Face Dimensions by Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Type A Valve Face-to-Face Dimensions by Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
42、 . . . . 75 Seating-surface Nominal Trim Material. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12vi1Check Valves: Flanged, Lug, Wafer, and Butt-welding1ScopeThis international standard covers design, material, face-to-face dimensions, pre
43、ssure-temperature ratings, andexamination, inspection, and test requirements for two types of check valves. Type A check valves are short face-to-face as defined in Table 3 and Table 4 and can be: wafer, lug, or doubleflanged; single plate or dual plate; gray iron, ductile iron, steel, nickel alloy,
44、 or other alloy designed for installationbetween Classes 125 and 250 cast iron flanges as specified in ASME B16.1, between Classes 150 and 300ductile iron flanges as specified in ASME B16.42, between Classes 150 and 2500 steel flanges as specified inASME B16.5, and between Classes 150 and 600 steel
45、pipeline flanges as specified in MSS SP-44 or steelflanges as specified in ASME B16.47. Type B bolted cover swing check valves are long face-to-face as defined in 5.1.2 and can be: flanged or butt-welding ends of steel, nickel alloy, or other alloy material. End flanges shall be as specified in ASME
46、 B16.5 orends shall be butt-welding as specified in ASME B16.25.This standard covers the following ranges: Type A valves:a) Classes 125 and 250, 50 DN 1200 (2 NPS 48) (excluding DN 90 NPS 31/2);b) Classes 150 and 300, 50 DN 1200 (2 NPS 48)*;c) Class 600, 50 DN 1050 (2 NPS 42)*;d) Classes 900 and 150
47、0, 50 DN 600 (2 NPS 24)*;e) Class 2500, 50 DN 300 (2 NPS 12)*; Type B valves:a) Classes 150 through 1500, 50 DN 600 (2 NPS 24)*;b) Class 2500, 50 DN 300 (2 NPS 12)*.NOTE *Valve sizes DN 90 and DN 125 (NPS 31/2 and 5) are non-preferred sizes whose usage is discouraged.Sizes:NPS: 2, 2 1/2, 3, 4, 6, 8,
48、 10, 12, 14, 16, 18, 20, 24, 30, 36, 42, 48;corresponding to nominal pipe sizes DN:DN: 50, 65, 80, 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 750, 900, 1050, 1200. Information to be specified by the purchaser is shown in Annex A.The standard nomenclature for valve parts is shown in Annex B. F
49、igure B.1, Figure B.2, Figure B.3, and Figure B.4illustrate typical Type A check valves and Figure B.5 illustrates a typical Type B check valve. These figures showtypical designs only and are not to be construed as precluding other available designs that comply with the2 API STANDARD 594requirements of this standard. The only purpose of these figures is to identify part names. The construction of a valveis acceptable only when it complies with this standard in all respects.2 Normative ReferencesThe
