《MSS-SP-125-2000.pdf》由会员分享，可在线阅读，更多相关《MSS-SP-125-2000.pdf（10页珍藏版）》请在三一文库上搜索。
1、STD-MSS SP-125-ENGL 2000 = 5770b110 05014111 UT3 D MSS SP-I 25-2000 Gray Iron and Ductile Iron In-line, Spring-Loaded, Center-Guided Checkvalves Standard Practice Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE Vienna,
2、Virginia 22180 (703) 281 -661 3 Copyright MSS Provided by IHS under license with MSSLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 08:30:50 MSTNo reproduction or networking permitted without license from IHS -,-,- STD-MSS SP-125-ENGL 2000 5770b40 05014L5 T3T D MS
3、S STANDARD PRACTICE SP-125 T h i s MSS Standard Practice was developed undes the consensus of the MSS Technical Committee 106 and the MSS Coarinating Committee. The content of this Standard Practice is a result of the eforts of competent and concerned volunteers to provide an effective, clear, and n
4、onexclusive speciftcation that wiil benefit the industry as a whole. This MSS Standard Practice i s intended as a basis for common practice by the manufacturer, the user, and the general public. The existence of an MSS Standard Practice does not i n itself preclude the manufacture, sale, or use of p
5、roducts not conforming to the Standard Practice. Mandatory conformance is established only by reference in a code, speciftcation, sales contract, or public law, as applicable. U n l e s s othawise specifically noted in this MSS Standard Practice any standard referred to haeh is identified by the dat
6、e of issue that was applicable to the referenced standarqs) at the date of issue of this MSS Standard Practice. (See Annex B . ) in t h i s Standard Practice all notes, m e x e s , tables, and figures are construed to be essential to the understanding of the message of the standard, and are consider
7、ed part of the text unless noted as “supplemental”. A l l appendices appearhg in this document are construed as “supplemental”. “Supplemental” information does not include mandatory requirements. U.S. customary u n i t s in the SP are the standard; the metric units are for reference oniy. Any part o
8、f this standard may be quoted. Credit lines should read Extractedfiom MSS SP-125, 2000 with permhsion of the publisher, the Manufacturers Standardization Society. Reproduction prohibited under copyright convention unless permission is granted by the Manufacturers Standardization Society of the Valve
9、 and Fittings Industry, Inc. Originally Approved August, 2000 Copyright O, 2000 by Manufacturers Standardization Society of the Valve and Fittings industry, inc. Printed m U.S.A. i Copyright MSS Provided by IHS under license with MSSLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Re
10、sale, 03/06/2007 08:30:50 MSTNo reproduction or networking permitted without license from IHS -,-,- STD.NSS SP-125-ENGL 2000 5770bli0 050141b 77b STANDARD PRACTICE TABLE OF CONTENTS SECTION TABLE ANNEX FIGURE SCOPE . 1 VALVE STYLES AND CLASSES . 1 PRESSURE AND TEMPERATURE RATINGS 1 MATERIALS 1 DESIG
11、N 2 WORKMANSHIP . . . 3 TESTS 3 MARKING . 3 PAZNTING 3 1 Disc and Seat Materials . 2 2 Pressure Ratings at 150F (65“ C).No n.Shock 2 3 Face-to-Face Dimensions of Wafer-Style Check Valves . 2 4 Faceto-Face Dimensions-of Compact Wafer-Style Check Valves 3 5 Faceto-Face D i m e n s i o n s of Globe-Sty
12、le Check Valves 3 6 Minimum Duration of T e s t s 3 A . Valve Types . . Figures Al to A6 . 4 Al Wafer Style . 1 A2 Compact Wafer-Style . 4 A3 Globestyle . I 4 A4 Wafer-Style . 5 A5 Compact Wafer-Style . 5 A6 Flanged GlobeStyle . 5 ANNEX B . Referenced Standards and Applicable Dates 6 ii Copyright MS
13、S Provided by IHS under license with MSSLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 08:30:50 MSTNo reproduction or networking permitted without license from IHS -,-,- MSS STANDARD PRACTICE SP-125 1 . 2. GRAY IRON AND DUCTILE IRON, IN-LINE, SPRINGLOADED, CENTER
14、-GUIDED CHECK VALVES 1.1 T h i s Standard Practice covers in-line, internaiiy spring-loaded, center-guided check valves made of gray iron or ductile i r o n . These valves, having the feature of limiting fluid f l o w to one direction only, are intended for use with clean fluids (i.e. fluids that do
15、 not contain solids), including potable water, waterworks, and other industrial applications, in harizontal and vertical installations. VALVE STYLES AND CLASSES 2.1 Valve slyles. The valve styles included in this standard are determined by the configuration of the body- 2.1.1 wafer. Wafer-style chec
16、k valves have a single flange body with an outside diameter equal to the mating pipe flanges. The valve body may be designed with holes passing through the body (see Figure Al) or with threaded lugs. The size range for wafer-style check valves i s NPS 2-10 (DN 50-250). 2.1.2 Compact Wafer. Compact w
17、afer-style valves have a reduced outside body diameter, o r slots, to provide bolt clearance for long bolts or studs (see Figure A2). The size range for compact wafer-style check valves i s NPS 2-10 (DN 50-250). 2.1.3 Globe. Globe-style check valves have two integrally cast flanges and a rouuded-cen
18、ter body section to provide increased flow area around the valve disc (see Figure A 3 ) . The size range of globe- style check valves is NPS 242 O N 50-1050). 2.2 Flange Clusses. Valve end connections shall confm to the following requirements. 2.2.1 Wafer-style valves shall have bolt holes or thread
19、ed holes i n accordance with ASME B16.1 for gray iron, Class 125 or 250 and in accordance with ASME B16.42 for ductile iron, C l a s s 150 or 300. 2.2.2 Compact wafer-style valves shall have a reduced body diameter to accommodate flange bolts in accordance with ASME B16.1 or B16.42. 2.2.3 accordance
20、 with ASME B16.1 for gray i r o n , Class Globestyle flange dimensions shall be i n 3. 4. 1 125 or 250 and in accordance with ASME B16.42 for ductile iron, C l a s s 150 or 300. 2.2.5 Cask&. Full face or ring gaskets are required between the valve ends and the mating pipeiine flanges to obtain a pre
21、ssure tight joint. PRESSURE AND TEMPERATURE RATINGS 3.1 The non-shock pressure ratings for various classes of valves are specified in Table 2. 3.2 The check valves in this Standard Practice are intended for use in clean fluids with a temperature between 33“ F and 150“ F (lo C and 65“ C). For elevate
22、d temperature installations, the manufacturer should be consulted. MATERIALS 4.1 General. This practice is intended to cover the minhum mechanical and chemical requirements for the items depicted i n Figures A4, A ! & and A6. 4.1.1 Body. The body shall be gray iron in accordance with ASTM A 126 Clas
23、s B or ductile iron in accordance with ASTM A 395 or ASTM A 536, Grades 70-50-05,6545-12 or 60- 45-18. 4.1.2 D i s c and Seat. The disc and seat shall be copper alloy or stainless steel, as specified in Table 1. ther bronze alloys may be specified by the purchaser providzd the lead content is below
24、8 percent and the zinc content below 16 percent. TABLE 1. DISC AND SEAT MATERIALS C95500 A 351 CFSM stainless 4.1.3 Spring. The spring shall be per ASTM A 313, Type 302,304,316, or 17-7PH. Copyright MSS Provided by IHS under license with MSSLicensee=IHS Employees/1111111001, User=listmgr, listmgr No
25、t for Resale, 03/06/2007 08:30:50 MSTNo reproduction or networking permitted without license from IHS -,-,- MSS STANDARD PRACTICE SP-125 CLASSES NPS 125 & 150 m. I mm. TABLE 2. PRESSURE RATINGS AT 150“ F (65“ Cl, NON-SHOCK CLASSES 250&300 m. I mm. SHELL TEST PRES. RATING AND 2-12 50-300 500 3447 750
26、 5171 14-42 350-1050 400 2758 600 4136 Iron 300 4 . 1 . 4 Resilient Seat. The resilient seating material shall be selected based on service conditions specified by the purchaser. 4 . 1 . 5 Guide Bushing. Guide bushings shall be provided in the center trunnion of the valve body and made from a copper
27、 alloy or stainless steel material suitable for use with the mating stem material. Bronze alloys shall contain less han 8 percent lead and 1 6 % Zinc. 5. DESIGN 5 . 1 GeneraL Valves shall be designed to prevent permanent distortion to the body, disc, or seat when subjected to the test pressures spec
28、ified in Table 2. Valves shall be designed to operate continuously at flow velocities of 10 ft./sec (3.05 dsec.) 5 . 2 Body Flanges. Gray iron flanges shall be drilled in accordance with ASME B16.1 for Classes 125 and 250. Gray iron flanges shall be flat faced unless otherwise specified. Ductile iro
29、n flanges shall be drilled i n accordance with ASME B16.42 for Classes 150 and 300. The flange finishes shall be in accordance with MSS SP-6. 5.3 Discs. Discs shall have integral or threaded stems, adequately guided for self-centering i n the valve body. i n the fll-open position, the seat port shal
30、l have a minimum area, not less than the area of a circle having a diameter equal to the nominal valve size. The valve disc or stem shali not extend past the valve ends when in the closed position. 5.4 Seais. Valve seats shall be corrosion resistant metal anc may incorporate an elastomeric seal. Ela
31、stomeric seals shall be bonded, vulcanized, ur mechanically secured to the valve disc or seat. 5.5 Springs. A valve spring shall be provided t o provide positive closure of the valve in harizontal and vertical flow-up applications. Vertical flow- down applications must be specified by the purchaser,
32、 in the event that a special spring is required. Springs shali be either heiical or umica compression type w i t h closed and ground ends, designe so that when the valve is fully open, the individual coils will not be over stressed or near the solid height. 5.6 Face-to-Face Dimensions. Faceto-face d
33、imensions for valves are specified i n Tables 3, 4 , and 5. A plus or minus tolerance of 1/16 in. ( 1 . 6 mm) shall be allowed on NPS 1 0 (DN 250) and smaller and 1/8 in. ( 3 . 2 mm) onWS 1 2 (DN 300) and larger. 2 Copyright MSS Provided by IHS under license with MSSLicensee=IHS Employees/1111111001
34、, User=listmgr, listmgr Not for Resale, 03/06/2007 08:30:50 MSTNo reproduction or networking permitted without license from IHS -,-,- STD-MSS SP-125-ENGL 2000 5770bll 0501Li17 bA5 NPS MSS STANDARD PRACTICE SP-125 CLASSES CLASSES 12s & 150 250 & 300 NPS 2-8 10-18 20-42 TABLE 5. FACE-TO-FACE DIMENSION
35、S OF GLOBE-STYLE CFIEC KVALVES ISHORT BODY LONG SEC. SEC. 30 15 60 30 120 60 I 24 24 610 32 30 29-114 743 - 36 45 1143 - 42 50 1270 - I 3 I 6 I 152 I 7-1/2 I 191 I 8 I 203 813 33-314 857 - - - - - - - - - 14 I 15-3/4 I 400 I 21 I 533 122-112 I 571 16 I 17-5/8 I 448 I 22-1/2 I 571 I 24 I 610 I 18 I 1
36、8-3/4 I 476 I 24 I 610 I25-1/2 I 648 I 20 I 20-5/8 I 524 I 27 I 686 I 28-1/2 I 724 6. WORKMANSHIP 6.1 Valve Parts. Valve parts shall be designed, and manufacturing tolerances maintained, to provide interchangeability of parts between manufacturers valves of the same size, class, me, and design. 6.2
37、Castings. All castings shall be clean and sound without defects which will impair their service. No plugging, impregnation, welding, or repairing of such defects will be allowed. 7 . TESTS 7.1 General. Pressure tests shall be made on all completed valves prior to shipment by the manufacturer. 7.2 Sh
38、ell Tes?. Valves shall be subjected to the hydrostatic pressure specified i n Table 2. No visible leakage is permitted through the pressure boundary wall. Test pressure shall be held for the minimum durations listed in Table 6. 7.3 Hydrostutjc Sea? Test. Valves shall be subjected to a hydrostatic se
39、at test, at not less t h a n the maximum working pressure for which the valve i s rated. The pressure shall be applied on the downstream si& of the valve and the opposite side checked for leakage. The maximum p d s i b l e leakage rate shall be 1 fluid ounce (30 mi) per hour per inch of nominal valv
40、e diameter. Resilient seated valves shail show no leakage. Test pressures shall be held for the durations specified in Table 6. TABLE 6. MINIMUM DURATION OF TESTS I VALVESIZE I SHELLTEST I SEATTEST 1 8. MARKING Marking shall conform to MSS SP-25. Markings may be cast o r stamped i n the valve body,
41、o r included on a corrosion resistant nameplate. 9. PAINTING The painting of finished valves shall be optional with the manufacturer, unless otherwise specified. 3 Copyright MSS Provided by IHS under license with MSSLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007
42、08:30:50 MSTNo reproduction or networking permitted without license from IHS -,-,- STDSMSS SP-125-ENGL 2000 W 5770b40 05011(20 3T7 MSS STANDARD PRACTICE SP-125 ANNEX A VALVE W E S - FIGURES Al THROUGH A3 COMPANION “Y FIANGE CASKET Wafer-Style Figure A l COMPANION FLANGE CASKET Compact Wafer-Style Fi
43、gure A2 COMPANION FLANGE GASKET Flanged Globe-Style Figure A3 The companion flanges, mounting hardware and flange gaskets are for illustration purposes only and are not furnished with the check valve. 4 Copyright MSS Provided by IHS under license with MSSLicensee=IHS Employees/1111111001, User=listm
44、gr, listmgr Not for Resale, 03/06/2007 08:30:50 MSTNo reproduction or networking permitted without license from IHS -,-,- MSS STANDARD PRACTICE SP-125 ANNEX A VALVE TYPES - FIGURES A4 THROUGH A6 Wafer - Style Compact Waf er - S tyle Figure A4 Figure A5 Flanged Globe-Style Figure A6 5 Copyright MSS P
45、rovided by IHS under license with MSSLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 08:30:50 MSTNo reproduction or networking permitted without license from IHS -,-,- MSS STANDARD PRACTICE SP-125 ANNEX B REFERENCED STANDARDS T h i s annex is an integral part of t
46、his Standard Practice which is placed after the m a i n text for convenience. List of standards and specifications referenced in this Standard Practice show the year of approval. Standard Name and Designation ASME. ANSUASME. ANSI. ASMEIANSI B16.1-1998 B16.42-1998 Cast Iron Pipe Flanges and Flanged F
47、ittings Ductile Iron Pipe Flanges and Flanged Fit- (Classes 150 and 300) ASTM STANDARD SPECIFICATION for: A 126-95e1 Gray Iron C a s - for Valves, Flanges, and Pipe Fittings A 313/A 313M-98 Stainless Steel Spring Wire A 3 5 1/A 3 5 1 M-94a( 1999) Castings, Austenitic, Austenitic-Ferritic (Duplex), f
48、or Pressure-Containing Parts A 536-8q1999)el Ductile Iron Castings B 148-97 Aluminum-Bronze Sand Castings B 584-98a Copper AUoy Sand Castings for General Applications SP-6-1996 SP-25-1998 Standard Finishes for Contact Faces of Pipe Flanges of Valves and Fittings Standard Marking System for Valves, Fittings, Flanges and U n i o n s Publications of the foilowing organizations appear in the above list: ANSI ASME ASTM MSS American National &Indards Institute, Inc. 11 West 42“ Street, New Y o r k , NY 10036 The American Soc