1、 MSS SP-126-2013 In-Line, Spring-Assisted, Center-Guided Check Valves (Carbon, Alloy Steel, Stainless Steel, each should be used independently of the other. Combining or converting values between the two systems may result in non-conformance with this Standard Practice. Substantive changes in this 2
2、013 edition are “flagged” by parallel bars as shown on the margins of this paragraph. The specific detail of the change may be determined by comparing the material flagged with that in the previous edition. Non-toleranced dimensions in this Standard Practice are nominal unless otherwise specified. E
3、xcerpts of this Standard Practice may be quoted with permission. Credit lines should read Extracted from MSS SP-126-2013 with permission of the publisher, Manufacturers Standardization Society of the Valve and Fittings Industry. Reproduction and/or electronic transmission or dissemination is prohibi
4、ted under copyright convention unless written permission is granted by the Manufacturers Standardization Society of the Valve and Fittings Industry Inc. All rights reserved. Originally Approved: December 1999 Originally Published: April 2001 Current Edition Approved: February 2013 (Updated March 201
5、3) Current Edition Published: May 2013 MSS is a registered trademark of Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright 2013 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-126 ii FO
6、REWORD Work on this Standard Practice began about 1990 to fulfill the industrys need for a standard covering this unique class of check valves. The intent of this Standard Practice, which was first published in 2001, is to include in-line (no bonnet) check valves whose closure member is assisted by
7、a spring in shutting before the flowing media can develop significant reverse velocity. Because this effect reduces the possibility of water hammer, these types of valves have also been termed “silent check valves”. This Standard Practice calls the valves “center-guided” meaning that the closure mem
8、ber is guided into the center of the flow forcing the flowing media to pass around it. Additionally, the closure member remains perpendicular to the flowing media throughout its entire travel. This 2013 edition removes the term “Steel” from the title and includes material types, to be inclusive of a
9、ll applicable valves, as indicated in Scope. In addition, the API-598 allowable closure leakage rates for SP-126 check valves were made the standard, with MSS SP-61 allowable closure leakage rates used at the manufacturers option. Due to the API 598 closure leakage rates being significantly higher t
10、han those required by MSS SP-61, a “Certificate of Test” for closure testing shall be specific to API 598 or MSS SP-61 when certification is required by a purchase order. Additional revisions include the normalization of Tables 5 and 6 with ASME B16.34 requirements, a clarification in Section 7.1.2,
11、 updating of references in Annex B, and other editorial or formatting corrections. MSS STANDARD PRACTICE SP-126 iii TABLE OF CONTENTS SECTION PAGE 1 SCOPE 1 2 STANDARD UNITS 1 3 VALVE STYLES AND CLASSES 1 4 END CONNECTIONS . 2 5 MATERIALS 2 6 DESIGN REQUIREMENTS 2 7 DIMEMSIONS AND TOLERANCES . 3 8 W
12、ELD REPAIR 3 9 TESTING 3 10 MARKING 4 11 PAINTING 4 TABLE 1 Face-to-Face Dimensions for Flanged Class 150, 300, and 600 Globe Style Check Valves (Inch) 5 1M Face-to-Face Dimensions for Flanged Class 150, 300, and 600 Globe Style Check Valves (mm) . 5 2 Face-to-Face Dimensions for Flanged Class 900,
13、1500, and 2500 Globe Style Check Valves (Inch) 6 2M Face-to-Face Dimensions for Flanged Class 900, 1500, and 2500 Globe Style Check Valves (mm) . 6 3 Face-to-Face Dimensions for Class 150, 300, 600, 900, and 1500 Wafer Style Check Valves (Inch) 7 3M Face-to-Face Dimensions for Class 150, 300, 600, 9
14、00, and 1500 Wafer Style Check Valves (mm) 7 4 Face-to-Face Dimensions for Class 150, 300, and 600 Flange Insert Style Check Valves (Inch) . 7 4M Face-to-Face Dimensions for Class 150, 300, and 600 Flange Insert Style Check Valves (mm) . 7 5 Minimum Shell Test Duration . 8 6 Alternate Gas Seat Closu
15、re Test 8 7 Minimum Seat Test Duration 8 FIGURE A1 Typical Globe Style Check Valves 9 A2 Typical Wafer Style Check Valve 10 A3 Typical Flange Insert Style Check Valve . 10 A4 Typical Threaded Style Check Valves . 11 A5 Typical Socket Weld Style Check Valve . 12 ANNEX A Valve Types Figures A1 through
16、 A5 . 9 B Referenced Standards and Applicable Dates 13 MSS STANDARD PRACTICE SP-126 1 1. SCOPE This Standard Practice covers in-line, center-guided, internally spring-assisted type check valves made of steel, or other alloys listed in Table 1 of ASME B16.34. These valves, having the feature of limit
17、ing fluid flow to one direction only, are intended for use with clean fluids (i.e., fluids that contain no solids). 2. STANDARD UNITS The value stated in either U.S. customary units or (SI) metric units are to be regarded separately as the standard. Within the text, the (SI) metric units are shown i
18、n parentheses. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in non-conformance with this Standard Practice. Class and NPS are the standard descriptors for Pressure Class an
19、d Nominal Size for both (SI) metric and U.S. customary products covered under this Standard Practice. NPS, followed by the dimensionless number, is the designation for nominal valve size. NPS is a standard size identification number related to the nominal diameter but not necessarily an actual dimen
20、sion. DN is frequently used in international standards. The European designation equivalent to NPS is called DN (diametre nominal/nominal diameter) in which sizes are based on (SI) metric units. The relationship is typically as follows: NPS DN 1/2 15 3/4 20 1 25 11432 11240 2 50 21265 3 80 4 100 3.
21、VALVE STYLES AND CLASSES The valve styles covered by this Standard Practice are determined by the valve body configuration and include globe, wafer, insert, threaded, and socket weld valve styles. ASME Pressure Classes covered by this Standard Practice are 150, 300, 600, 900, 1500, and 2500. Valves
22、meeting the requirements of this Standard Practice may be used within the pressure-temperature ratings of ASME B16.34, Standard Pressure Class. 3.1 Globe Style Globe style check valves have two flanges integrally cast or forged in the valve body, which is secured between the end gaskets and mating p
23、ipeline flanges by threaded fasteners that pass through bolt holes in these flanges. 3.2 Wafer Style Wafer style check valves are secured between end gaskets and pipeline flanges by bolts that pass outside their pressure boundary wall. The body may be cylindrical or sculpted to allow for bolt cleara
24、nce. 3.3 Flange Insert Style Flange insert style check valves contain trim that protrudes into upstream and/or downstream piping. This valve style is secured between gaskets and pipeline flanges by bolts which pass outside the body circumference. This valve style is designed to function inside Sched
25、ule 40 or Standard Schedule pipe for Class 150 and 300 designs and Schedule 40 or 80 pipe for Class 600 designs. 3.4 Threaded Style Threaded style check valves have tapered National Pipe Threads (NPT) that are machined in each end of the valve body for assembly with similarly threaded piping or fitt
26、ings. The end connections may be internally or externally threaded. IN-LINE, SPRING-ASSISTED, CENTER-GUIDED CHECK VALVES (CARBON, ALLOY STEEL, STAINLESS STEEL, ANSI/ASME B1.20.1-1983 (R2006) Pipe Threads, General Purpose (Inch) B16.5-2009 Pipe Flanges and Flanged Fittings NPS 1/2 Through NPS 24 Metr
27、ic/Inch Standard B16.11-2011 Forged Fittings, Socket-Welding and Threaded B16.34-2013 Valves Flanged, Threaded, and Welding End API 598-2009 Valve Inspection and Testing MSS SP-6-2012 Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings SP-25-2008 Sta
28、ndard Marking System for Valves, Fittings, Flanges, and Unions SP-86-2009 Guidelines for Metric Data in Standards for Valves, Flanges, Fittings, and Actuators; including Errata Sheet (2011) SP-61-2013 Pressure Testing of Valves The following organizations appear in the above list: ANSI American Nati
29、onal Standards Institute, Inc. 25 West 43rd Street, Fourth Floor New York, NY 10036-7406 API American Petroleum Institute 1220 L Street, NW Washington, DC 20005-4070 ASME American Society of Mechanical Engineers (ASME International) Two Park Avenue New York, NY 10016-5990 MSS Manufacturers Standardi
30、zation Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE Vienna, VA 22180-4602 Listing of MSS Standard Practices (as of May, 2013) TITLE SP-6-2012 Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings SP-9-2013 Spot Facing for Bronze
31、, Iron, and Steel Flanges SP-25-2008 Standard Marking System for Valves, Fittings, Flanges, and Unions SP-42-2013 Corrosion-Resistant Gate, Globe, Angle, and Check Valves with Flanged and Butt Weld Ends (Classes 150, 300 & 600) SP-43-2013 Wrought and Fabricated Butt-Welding Fittings for Low Pressure
32、, Corrosion Resistant Applications SP-44-2010 Steel Pipeline Flanges (incl. 2011 Errata Sheet) SP-45-2003 (R 2008) Bypass and Drain Connections SP-51-2012 Class 150LW Corrosion Resistant Flanges and Cast Flanged Fittings SP-53-2012 Quality Standard for Steel Castings and Forgings for Valves, Flanges
33、, Fittings, and Other Piping Components Magnetic Particle Examination Method SP-54-2013 Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components Radiographic Examination Method SP-55-2011 Quality Standard for Steel Castings for Valves, Flanges, Fitt
34、ings, and Other Piping Components Visual Method for Evaluation of Surface Irregularities (ANSI-approved American National Standard) SP-58-2009 Pipe Hangers and Supports Materials, Design, Manufacture, Selection, Application, and Installation (incorporates content of SP-69, 77, 89, and 90) (ANSI-appr
35、oved American National Standard) SP-60-2012 Connecting Flange Joints between Tapping Sleeves and Tapping Valves SP-61-2013 Pressure Testing of Valves SP-65-2012 High Pressure Chemical Industry Flanges and Threaded Stubs for Use with Lens Gaskets SP-67-2011 Butterfly Valves SP-68-2011 High Pressure B
36、utterfly Valves with Offset Design SP-69-2003 Pipe Hangers and Supports Selection and Application (ANSI-approved American National Standard) SP-70-2011 Gray Iron Gate Valves, Flanged and Threaded Ends SP-71-2011 Gray Iron Swing Check Valves, Flanged and Threaded Ends (incl. 2013 Errata Sheet) SP-72-
37、2010a Ball Valves with Flanged or Butt-Welding Ends for General Service SP-75-2008 Specification for High-Test, Wrought, Butt-Welding Fittings SP-78-2011 Gray Iron Plug Valves, Flanged and Threaded Ends SP-79-2011 Socket Welding Reducer Inserts SP-80-2013 Bronze Gate, Globe, Angle, and Check Valves
38、SP-81-2013 Stainless-Steel or Stainless-Steel-Lined, Bonnetless, Knife Gate Valves with Flanged Ends SP-83-2006 Class 3000 Steel Pipe Unions Socket Welding and Threaded SP-85-2011 Gray Iron Globe & Angle Valves, Flanged and Threaded Ends SP-86-2009 Guidelines for Metric Data in Standards for Valves,
39、 Flanges, Fittings, and Actuators (Incl. 2011 Errata Sheet) SP-87-1991 (R 1996 Reinstated 2011) Factory-Made Butt-Welding Fittings for Class I Nuclear Piping Applications SP-88-2010 Diaphragm Valves SP-91-2009 Guidelines for Manual Operation of Valves SP-92-2012 MSS Valve User Guide SP-93-2008 Quali
40、ty Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components Liquid Penetrant Examination Method SP-94-2008 Quality Standard for Ferritic and Martensitic Steel Castings for Valves, Flanges, Fittings, and Other Piping Components Ultrasonic Examination Method
41、SP-95-2006 Swage(d) Nipples and Bull Plugs SP-96-2011 Guidelines on Terminology for Valves and Fittings SP-97-2012 Integrally Reinforced Forged Branch Outlet Fittings Socket Welding, Threaded, and Buttwelding Ends SP-98-2012 Protective Coatings for the Interior of Valves, Hydrants, and Fittings SP-9
42、9-2010 Instrument Valves SP-100-2009 Qualification Requirements for Elastomer Diaphragms for Nuclear Service Diaphragm Valves SP-101-1989 (R 2001) Part-Turn Valve Actuator Attachment Flange and Driving Component Dimensions and Performance Characteristics SP-102-1989 (R 2001) Multi-Turn Valve Actuato
43、r Attachment Flange and Driving Component Dimensions and Performance Characteristics SP-104-2012 Wrought Copper Solder-Joint Pressure Fittings SP-105-2010 Instrument Valves for Code Applications SP-106-2012 Cast Copper Alloy Flanges and Flanged Fittings: Class 125, 150, and 300 SP-108-2012 Resilient
44、-Seated Cast Iron Eccentric Plug Valves SP-109-2012 Weld-Fabricated Copper Solder-Joint Pressure Fittings (incl. 2012 Errata Sheet) SP-110-2010 Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends (incl. 2010 Errata Sheet) SP-111-2012 Gray-Iron and Ductile-Iron Tapping Sleeves
45、 SP-112-2010 Quality Standard for Evaluation of Cast Surface Finishes Visual and Tactile Method. This SP must be used with a 10-surface, three dimensional Cast Surface Comparator, which is a necessary part of the standard. Additional Comparators available separately. SP-113-2012 Connecting Joints be
46、tween Tapping Machines and Tapping Valves SP-114-2007 Corrosion Resistant Pipe Fittings Threaded and Socket Welding Class 150 and 1000 (ANSI-approved American National Standard) SP-115-2010 Excess Flow Valves, 1 NPS and Smaller, for Fuel Gas Service SP-116-2011 Service-Line Valves and Fittings for D
47、rinking Water Systems SP-117-2011 Bellows Seals for Globe and Gate Valves SP-119-2010 Factory-Made Wrought Belled End Pipe Fittings for Socket-Welding SP-120-2011 Flexible Graphite Packing System for Rising Stem Valves Design Requirements SP-121-2006 Qualification Testing Methods for Stem Packing fo
48、r Rising Stem Steel Valves SP-122-2012 Plastic Industrial Ball Valves SP-123-2013 Non-Ferrous Threaded and Solder-Joint Unions for Use with Copper Water Tube SP-124-2012 Fabricated Tapping Sleeves SP-125-2010 Gray Iron and Ductile Iron In-Line, Spring-Loaded, Center-Guided Check Valves SP-126-2013 I
49、n-Line, Spring-Assisted, Center-Guided Check Valves (Carbon, Alloy Steel, Stainless Steel, & Nickel Alloys) SP-127-2001 Bracing for Piping Systems Seismic-Wind-Dynamic Design, Selection, Application SP-128-2012 Ductile Iron Gate Valves SP-129-2003 (R 2007) Copper-Nickel Socket-Welding Fittings and Unions SP-130-2013 Bellows Seals for Instrument Valves SP-131-2010 Metallic Manually Operated Gas Distribution Valves SP-132-2010 Compression Packing Systems for Instrument Valves SP-133-2010 Excess Flow Valves for Low Pressure Fuel Gas Appli
