1、 MSS SP-136-2014 Ductile Iron Swing Check Valves Standard Practice Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE Vienna, Virginia 22180-4602 Phone: (703) 281-6613 Fax: (703) 281-6671 E-mail: standardsmss-hq.org www.ms
2、s-hq.org MSS STANDARD PRACTICE SP-136i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 106 and the MSS Coordinating Committee. The content of this Standard Practice is the resulting efforts of competent and experienced volunteers to provide an effective, c
3、lear, and non-exclusive standard that will benefit the industry as a whole. This MSS Standard Practice describes minimal requirements and is 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 in itself pre
4、clude the manufacture, sale, or use of products not conforming to the Standard Practice. Mandatory conformance to this Standard Practice is established only by reference in other documents such as a code, specification, sales contract, or public law, as applicable. MSS has no power, nor does it unde
5、rtake to enforce or certify compliance with this document. Any certification or other statement of compliance with the requirements of this Standard Practice shall not be attributable to MSS and is solely the responsibility of the certifier or maker of the statement. “Unless indicated otherwise with
6、in this MSS Standard Practice, other standards documents referenced to herein are identified by the date of issue that was applicable to this Standard Practice at the date of approval of this MSS Standard Practice (see Annex C). This Standard Practice shall remain silent on the validity of those oth
7、er standards of prior or subsequent dates of issue even though applicable provisions may not have changed.” By publication of this Standard Practice, no position is taken with respect to the validity of any potential claim(s) or of any patent rights in connection therewith. MSS shall not be held res
8、ponsible for identifying any patent rights. Users are expressly advised that determination of patent rights and the risk of infringement of such rights are entirely their responsibility. In this Standard Practice, all text, notes, annexes, tables, figures, and references are construed to be essentia
9、l to the understanding of the message of the standard, and are considered normative unless indicated as “supplemental”. All appendices, if included, that appear in this document are construed as “supplemental”. Note that supplemental information does not include mandatory requirements. The SI (metri
10、c) units and U.S. customary units in this Standard Practice are regarded separately as the standard; 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. This Standard Practice has been subst
11、antially revised from the previous 2007 edition. It is suggested that if the user is interested in knowing what changes have been made, that direct page by page comparison should be made of this document and that of the previous edition. Non-toleranced dimensions in the Standard Practice are nominal
12、 unless otherwise specified. Excerpts of this Standard Practice may be quoted with permission. Credit lines should read Extracted from MSS SP-136-2014 with permission of the publisher, Manufacturers Standardization Society of the Valve and Fittings Industry. Reproduction and/or electronic transmissi
13、on or dissemination is prohibited under copyright convention unless written permission is granted by the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. All rights reserved. Originally Published: February 2007 Current Edition Approved: December 2014 Current Edition Pub
14、lished: September 2014 MSS is a registered trademark of the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 2014 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-136ii TABLE OF CONT
15、ENTS SECTION PAGE 1 SCOPE 1 2 VALVE DESIGNATION, CLASSES, AND SIZES . 1 3 PRESSURE-TEMPERATURE RATINGS 2 4 MATERIALS . 2 5 DESIGN . 3 6 WORKMANSHIP 4 7 PRESSURE TESTING . 4 8 MARKING . 5 9 COATING AND PAINTING . 5 TABLE 1 Pressure-Temperature Ratings, ASTM A395/A395M, Non-Shock, psi . 6 2 Pressure-T
16、emperature Ratings, ASTM A536, Non-Shock, psi 6 3 Shell Test Pressure 7 4 Minimum Duration of Tests . 7 B1 Pressure-Temperature Ratings, ASTM A395/A395M, Non-Shock, bar 9 B2 Pressure-Temperature Ratings, ASTM A536, Non-Shock, bar 9 ANNEX A Valve Types Figures A1 through A4 . 8 B Pressure-Temperature
17、 Ratings in (SI) Metric Units . 9 C Referenced Standards and Applicable Dates 10 MSS STANDARD PRACTICE SP-1361 1. SCOPE 1.1 This Standard Practice establishes requirements for ductile iron swing check valves with flanged, threaded, mechanical-joint, and push-on ends for general purpose. This Standar
18、d Practice covers check valves for installation in pipelines that are horizontal or in pipelines where flow is above horizontal up to vertical with flow upward. 1.2 This Standard Practice describes ductile iron check valves in two categories: 1.2.1 Class rated valves, assigned a pressure and tempera
19、ture rating as prescribed in an appropriate ASME standard. 1.2.2 Valves limited to Cold Working Pressure (CWP) which are only limited to water service. 1.3 This Standard Practice also includes, directly or by reference, requirements for chemical and physical properties of materials and pressure test
20、s. 2. VALVE DESIGNATION, CLASSES, AND SIZES 2.1 Valve Types Valve types covered herein are illustrated in Figures A1 through A4 in Annex A(1). Swing check valves are classified in relation to the flow cross-sectional area or waterway as either Full-Waterway or Clear-Waterway and by the seating mater
21、ials as either metallic or composition. The waterway classifications are defined as: a) Full-Waterway Valves shall have a flow cross-sectional area through the valves that is not less than the cross-sectional area of a circle having a diameter equal to the valves NPS expressed in inches or valves DN
22、 expressed in millimeters. NOTE: (1) The valve sketches herein are for the purpose of illustration and nomenclature only. They are not intended to exclude any design meeting this Standard Practice. b) Clear-Waterway Valves shall have an unobstructed cylindrical flow path through the valve. The diame
23、ter of the flow path shall be equal to the valves NPS expressed in inches or valves DN expressed in millimeters. When the valve is in the open position, the disc shall swing completely clear of the waterway. c) The combinations of waterway and seating material classifications are designated by type
24、as follows: Type I (Figure A1) Full-Waterway Metal-to-Metal Seats Type II (Figure A2) Full-Waterway Composition-to-Metal Seats Type III (Figure A3) Clear-Waterway Metal-to-Metal Seats Type IV (Figure A4) Clear-Waterway Composition-to-Metal Seats 2.2 Trim and Trim Combination Designations Valve seati
25、ng-surfaces and operating-components shall be one of the following or a combination of the following: a) Copper Alloy b) Ferrous c) Stainless Steel d) Composition or Resilient Seat 2.3 Rating Designation(2)Valves shall be in accordance with one of the following rating designations: a) ASME B16.1 Cla
26、ss 125 b) ASME B16.1 Class 250 c) ASME B16.42 Class 150 d) ASME B16.42 Class 300 e) MSS SP-136 250 CWP f) MSS SP-136 350 CWP NOTE (2): Class designations are specific to the standard in which they are defined and are therefore not relatable to the nominal pressure (PN) designations used in internati
27、onal standards. DUCTILE IRON SWING CHECK VALVES MSS STANDARD PRACTICE SP-1362 2.4 Nominal Pipe Sizes Nominal pipe sizes (NPS) covered by this Standard Practice are: a) NPS 2 through NPS 48, flanged end b) NPS 2 through NPS 6, threaded end c) NPS 3 through NPS 48, mechanical-joint end d) NPS 2 throug
28、h NPS 12, push-on end 2.5 Nominal Diameter Pipe Sizes Nominal diameter or “diameter nominal” pipe sizes (DN) covered by this Standard Practice are: a) DN 50 through DN 1200, flanged end b) DN 50 through DN 150, threaded end c) DN 80 through DN 1200, mechanical-joint end d) DN 50 through DN 300, push
29、-on end 3. PRESSURE-TEMPERATURE RATINGS 3.1 Pressure-temperature ratings designations are shown in Tables 1 and 2 in psi and degrees Fahrenheit units. SI (metric) units (bar and degrees Celsius) are shown in Tables B1 and B2 in Annex B. The ratings are for valves with metal seating surfaces. Pressur
30、e-temperature ratings for valves with composition seating materials must be limited to reflect the physical characteristics of these materials at each temperature, and may be lower but in no case higher than the values shown in Tables 1 and B1. 3.2 The pressure-temperature ratings shown in Table 1 s
31、hall apply for valves made from material conforming to ASTM A395/A395M and meeting the applicable requirements of ASME B16.42. 3.3 The pressure-temperature ratings shown in Table 2 shall apply for valves made from material conforming to ASTM A536 and meeting the applicable requirements of ASME B16.1
32、. 3.4 The temperature shown for the corresponding rating shall be the metal temperature of the pressure retaining parts. It shall be assumed that the metal temperature other than that of the contained fluid shall be the responsibility of the user. 3.5 Valves for water, exhibiting a temperature range
33、 of 33 to 150 F (1 to 65 C) and designated as CWP, shall have rated pressures of 250 or 350 psi (17 or 24 bar). 4. MATERIALS 4.1 General This Standard Practice establishes physical and chemical requirements. Users are cautioned against applications with fluids which may react chemically with any mat
34、erials used in these valves. Consultation with the manufacturer is advised to determine suitability in cases of doubt. 4.1.1 Body and Cover The body and cover for valves designated as ASME B16.42 Class 150 or Class 300 shall be made of ductile iron in accordance with ASTM A395/A395M. The body and co
35、ver for valves designated as 250 or 350 CWP or as ASME B16.1 Class 125 or Class 250 shall be of ductile iron in accordance with either ASTM A395/A395M or A536. 4.1.2 Seating Material a) Metal-to-metal seating surfaces shall be copper alloy for bronze trim valves, ductile iron or other ferrous materi
36、al for all-iron trim valves, or stainless steel for stainless steel-trim valves. b) Facing material for a composition or resilient seat shall be rubber (synthetic or natural), or suitable polymer. c) Other seating materials, either metal or composition, which are suitable for the intended service ma
37、y be furnished when agreed upon by purchaser and manufacturer. 4.1.3 Hinge Pins Hinge pins shall be wrought brass or stainless steel for bronze trim valves, wrought steel or stainless steel for all-iron valve trim, or wrought stainless steel for stainless steel trim valves. 4.1.4 Hinge Non-ferrous h
38、inges shall not be used on all-iron trim valves. 4.1.5 Side Plugs Side plugs, if used, shall be made of gray iron, malleable iron, ductile iron or steel. However, if used to support the hinge pin in bronze trim valves, they shall be of copper alloy or copper alloy bushed. MSS STANDARD PRACTICE SP-13
39、63 4.1.6 Bolting Bolts and studs connecting pressure containing parts shall have minimum yield and ultimate strength properties of not less than the requirements of ASTM A307. 5. DESIGN 5.1 General The closure assembly shall be designed to assume the closed position by gravity under no flow conditio
40、ns in a horizontal pipeline. Special arrangements of levers and springs or weights may be necessary to assure proper closure in lines which are inclined or vertical. 5.1.1 Valves shall be designed to prevent distortion when subjected to the test pressures in Section 7. 5.1.2 Distortions are not acce
41、ptable that prevent the safe operation of valves when valves are under the test pressure specified in Section 7. 5.2 Wall Thickness The minimum wall thickness for valve bodies and covers shall be as specified below: 5.2.1 Class Rated Valves 5.2.1.1 Pressure rated Class 125 and Class 250 check valves
42、 of ASTM A536 ductile iron bodies shall have a minimum wall thickness as specified in ASME B16.1 for the corresponding Class and NPS fitting. The cover shall have a minimum thickness of a blind flange per ASME B16.1 where the bolt circle is equal to or greater than the valve cover bolt circle. 5.2.1
43、.2 Pressure rated Class 150 and Class 300 check valves of ASTM A395/A395M ductile iron bodies shall have a minimum wall thickness as specified in ASME B16.42 for the corresponding Class and NPS fitting. The cover will have a minimum thickness of a blind flange per ASME B16.42 where the bolt circle i
44、s equal to or greater than the valve cover bolt circle. 5.2.2 CWP Rated Valves Valves with ASTM A395/A395M or ASTM A536 ductile iron bodies and CWP designations shall have body and cover wall thicknesses in accordance with ASME B16.42 Class 150 wall thickness for 250 CWP or Class 300 wall thickness
45、for 350 CWP. 5.2.3 Additional metal thickness needed for assembly loads, shapes other than circular, stress concentrations, or other special circumstances, must be determined by individual manufacturers since these factors vary widely. 5.3 End Connections 5.3.1 Flanged Ends 5.3.1.1 End flanges shall
46、 be integral with the valve body. Dimensions, tolerances, and drilling shall be in accordance with ASME B16.42 for valves made of ASTM A395 and ASME B16.1 for valves of ASTM A536 material, for each respective pressure class. For CWP rated valves, end flanges shall be in accordance with AWWA C110/A21
47、.10 or ASME B16.1, at the manufacturers option. 5.3.1.2 Unless otherwise specified by the applicable ASME B16.1, ASME B16.42, AWWA C110/A21.10 or the purchaser, the flanges shall be fully machined on the joint side in accordance with MSS SP-6. 5.3.1.3 Face-to-face dimensions of flanged end valves sh
48、all be as follows: 5.3.1.3.1 Class 125, Class 150 (ASTM A536), or CWP, Full-Waterway, Figures A1 and A2, NPS 2 12 (DN 50 300), in accordance with ASME B16.10. 5.3.1.3.2 Class 150 (ASTM A395/A395M), Full-Waterway, Figures A1 and A2, NPS 2 12 (DN 50 300), in accordance with ASME B16.10. 5.3.1.3.3 Clas
49、s 125, 150 or CWP, Full-Waterway, Figures A1 and A2, NPS 14 48 (DN 350 1200), as per manufacturers specification. 5.3.1.3.4 Class 125, 150 or CWP, Clear-Waterway, Figures A3 and A4, NPS 2 24 (DN 50 600), as per manufacturers specification. MSS STANDARD PRACTICE SP-1364 5.3.1.3.5 Class 300 (ASTM A395/A395M), Full-Waterway, Figure A1, NPS 2 12 (DN 50 300), in accordance with ASME B16.10. 5.3.1.3.6 Class 250 or 300 (ASTM A536), Full-Waterway, Figure A1, NPS 2 12 (DN 50 300), in accordance with ASME B16.10. 5.3.1.3.7 Class 250 or
