1、MSS SP-67-2017 Butterfly 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: standardsmsshq.org www.msshq.org MSS STANDA
2、RD PRACTICE SP-67i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 407 and the MSS Coordinating Committee. The content of this Standard Practice is the resulting efforts of competent and experienced volunteers to provide an effective, clear, and non-exclus
3、ive 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 preclude the manufactur
4、e, 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 undertake, to enforce or
5、 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 within this MSS Standar
6、d 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 B). This Standard Practice shall remain silent on the validity of those other standards of pri
7、or 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 responsible for identi
8、fying 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 essential to the understand
9、ing 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. U.S. customary units in this Sta
10、ndard Practice are the standard; SI (metric) units are for reference only. Substantive changes in this 2017 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 previou
11、s edition. Non-toleranced dimensions in this Standard Practice are nominal unless otherwise specified. Excerpts of this Standard Practice may be quoted with permission. Credit lines should read Extracted from MSS SP-67-2017 with permission of the publisher, Manufacturers Standardization Society of t
12、he Valve and Fittings Industry. Reproduction and/or electronic transmission 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: M
13、ay 1964 Current Edition Approved: September 2016 Current Edition Published: May 2017 MSS is a registered trademark of Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 2017 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Prin
14、ted in U.S.A. MSS STANDARD PRACTICE SP-67ii TABLE OF CONTENTS SECTION PAGE 1 SCOPE . 1 2 DEFINITIONS 1 3 STANDARD ENDS 1 4 DESIGN REQUIREMENTS . 2 5 VALVE DISC CLEARANCE . 4 6 TRIM . 4 7 FACE-TO-FACE DIMENSIONS . 4 8 ACTUATORS . 5 9 PURCHASING INFORMATION . 5 10 PRODUCTION TESTING 6 11 MARKING 7 TAB
15、LE 1 Pipe Minimum Diameters for Disc Clearance . 8 2 Face-to-Face Dimensions, Flanged-End Valves 9 3 Face-to-Face Dimensions, Single-Flange, and Flangeless Valves 10 4 End-to-End Dimensions, Grooved-End Valves . 11 A1 Disc-to-Pipe Minimum Clearances . 16 FIGURE 1 Face-to-Face, Flangeless, and Single
16、-Flange Valves (includes 1A, 1B, and 1C) . 12 2 Flanged Ends, Bolting Options 13 3 Single Flanged, Bolting Options . 13 4 Flangeless, Bolting Options . 13 5 End-to-End, Grooved-End Valves . 14 6 Shouldered-End Valves . 14 7 Disc-to-Pipe Minimum Clearance, Typical Concentric Type Construction 15 ANNE
17、X A Disc-to-Pipe Clearance 16 B Reference Standards and Applicable Dates . 17 MSS STANDARD PRACTICE SP-671 BUTTERFLY VALVES 1. SCOPE 1.1 This Standard Practice covers dimensions, design, testing, and marking requirements for butterfly valves. Further reference should be made to the MSS SP-68. 1.2 Th
18、is Standard Practice covers two types of butterfly valves: Type I Valves for tight shut-off (Tested per Section 10.2.1) Type II Valves permitting seat leakage (See Section 10.2.2) 1.3 This Standard Practice covers flangeless (wafer-type), single-flange (lug-type), and flanged-end valves in size NPS
19、1 through NPS 72, along with grooved-end valves, and shouldered-end valves, with pressure ratings in accordance with the requirements of Sections 3 and 4. 2. DEFINITIONS 2.1 CWP Cold Working Pressure (PSIG) The pressure rating for the pressure containing components of the valve at temperatures up to
20、 and including 100 F. 2.2 Differential Pressure The difference in pressure between two points located on opposite sides of the valve disc. 2.3 Face-to-Face of Valve before Installation This is the dimension of the valve, face-to-face, before it is installed in the pipeline. It does not include the t
21、hickness of gaskets if separate gaskets are used. It does include the thickness of gaskets or seals that are an integral part of the valve and this dimension is before these gaskets or seals are compressed. 2.4 Face-to-Face of Valve Installed This is the dimension of the valve, face-to-face, after i
22、t is installed in the pipeline. It does not include the thickness of gaskets if separate gaskets are used. It does include the thickness of gaskets or seals that are an integral part of the valve; however, this dimension is established with the gaskets or seals compressed. See Figures 1A, 1B, 1C, an
23、d Table 3. 2.5 Face-to-Face of Valve and Gaskets Installed This is the dimension of the valve, face-to-face, including separate gaskets when installed in the pipeline. This dimension must be established using the thickness of the valves face-to-face dimension and the compressed thickness of the gask
24、ets to be used in such installations. 2.6 Shut-Off Pressure The maximum rated differential pressure with the valve in the fully closed position. 2.7 System Pressure Maximum specified operating pressure for the application. 3. STANDARD ENDS 3.1 Flanged Ends Valves with this end type shall be compatib
25、le for use with flanges conforming to: ASME B16.1, Class 25 or 125; ASME B16.5, Class 150; ASME B16.47, Class 150 Series A; ASME B16.24, Class 150; ASME B16.42, Class 150; or AWWA C207. Figure 2 illustrates bolting options. 3.2 Single Flange (Lug-Type) Valves with this end type shall be compatible f
26、or use with flanges conforming to: ASME B16.1, Class 25 or 125; ASME B16.5, Class 150; ASME B16.24, Class 150; ASME B16.42, Class 150; or AWWA C207. Figure 3 illustrates bolting options. MSS STANDARD PRACTICE SP-672 3.3 Flangeless (Wafer-Type) Valves with this end type shall be compatible for use wi
27、th flanges conforming to: ASME B16.1, Class 25 or 125; ASME B16.5, Class 150; ASME B16.24, Class 150; ASME B16.42, Class 150; or AWWA C207. Figure 4 illustrates bolting options. 3.4 Grooved Ends Valves with this end type shall conform to AWWA C606. 3.5 Shouldered Ends Valves with this end type shall
28、 conform to AWWA C606. 4. DESIGN REQUIREMENTS 4.1 Wall Thickness The design requirements of this section apply only to the valve body. The disc and shaft are specifically excluded. 4.1.1 Steel, Nickel Alloy and other Special Alloy Valves 4.1.1.1 Valves that conform to the applicable requirements of
29、ASME B16.34 shall have body pressure-temperature ratings in accordance with that standard. For valves that do not conform to the applicable requirements of ASME B16.34, then Section 4.1.1.2 or 4.1.1.3 of this Standard Practice shall be used to determine the minimum required wall thickness. 4.1.1.2 V
30、alves that do not conform to the applicable requirements of ASME B16.34 shall have their minimum wall thickness determined using the following equation: Where: P = Pressure rating at temperature under consideration, psi d = Inside diameter of valve body (or shaft bore in body for the body neck of fl
31、angeless valves), in. S = Allowable stress, psi The allowable stress shall be taken from the ASME Boiler and Pressure Vessel Code (BPVC), Section I (or if not listed, use Section VIII, Division I). If the material is not listed in either of these Code sections, then the allowable stress shall be det
32、ermined using the method contained in ASME BPVC, Section VIII, Division I, Appendix P. For cast materials, use the appropriate casting quality factor from UG-24 of ASME BPVC, Section VIII, Division I. 4.1.1.3 As an alternative to Section 4.1.1.2, valves that do not conform to the applicable requirem
33、ents of ASME B16.34 shall have the maximum allowable pressure determined by using a proof test in accordance with UG-101 of ASME BPVC, Section VIII, Division I. 4.1.2 Bronze and Bronze Alloy Valves 4.1.2.1 Valves that conform to the applicable requirements of ASME B16.24 shall have body pressure-tem
34、perature ratings in accordance with that standard. For valves that do not conform to the applicable requirements of ASME B16.24, then Sections 4.1.2.2 or 4.1.2.3 of this Standard Practice shall be used to determine the minimum required wall thickness. 4.1.2.2 Valves that do not conform to the applic
35、able requirements of ASME B16.24 shall have the minimum wall thickness determined using methods that result in designs which are as conservative as those used in that standard. 4.1.2.3 As an alternative to Section 4.1.2.2, valves that do not conform to the applicable requirements of ASME B16.24 shal
36、l have the maximum allowable pressure determined by using a proof test in accordance with UG-101 of ASME BPVC, Section VIII, Division I. P2.1S2Pd5.1tMSS STANDARD PRACTICE SP-673 4.1.3 Cast Iron Valves 4.1.3.1 Valves that conform to the applicable requirements of ASME B16.1 or AWWA C504 shall conform
37、 to the body pressure-temperature requirements in accordance with the respective standard. For valves that do not conform to the applicable requirements of ASME B16.1 or AWWA C504, then Sections 4.1.3.2 or 4.1.3.3 of this Standard Practice shall be used to determine the minimum required wall thickne
38、ss. 4.1.3.2 Valves that do not conform to the applicable requirements of ASME B16.1 or AWWA C504 shall have the minimum wall thickness determined by using methods which result in designs that are as conservative as those used in these standards. 4.1.3.3 As an alternative to Section 4.1.3.2, valves t
39、hat do not conform to the applicable requirements of ASME B16.1 or AWWA C504 shall have the maximum allowable pressure determined by using a proof test in accordance with UG-101 of ASME BPVC, Section VIII, Division I. 4.1.4 Ductile Iron Valves 4.1.4.1 Valves that conform to the applicable requiremen
40、ts of ASME B16.42 or AWWA C504 shall conform to the body pressure-temperature requirements in accordance with the respective standard. For valves that do not conform to the applicable requirements of ASME B16.42 or AWWA C504, then Sections 4.1.4.2 or 4.1.4.3 of this Standard Practice shall be used t
41、o determine the minimum required wall thickness. 4.1.4.2 Valves that do not conform to the applicable requirements of ASME B16.42 or AWWA C504 shall have the minimum wall thickness determined by using methods that result in designs which are as conservative as those used in these standards. Referenc
42、e Annex C of ASME B16.42. 4.1.4.3 As an alternative to Section 4.1.4.2, valves that do not conform to the applicable requirements of ASME B16.42 or AWWA C504 shall have the maximum allowable pressure determined by using a proof test in accordance with UCD-101 of ASME BPVC, Section VIII, Division I.
43、4.1.5 Reduced Body Wall Thickness 4.1.5.1 The body material thickness between the shaft bore in the body and adjacent bolt holes shall not be less than 25% of the required wall thickness of the body neck. 4.2 Flange Thickness If materials other than those listed in the flange standards in Section 2
44、are used for flanged-end valves, the minimum flange thickness shall be determined by using methods that are as conservative as those used in the standard appropriate for the material of construction. In no case shall the minimum flange thickness be less than that listed in the standard for the flang
45、e rating under consideration. 4.3 Pressure Rating Valves may be designed for shut-off pressure rating or differential pressures lower than the body pressure rating. This pressure rating shall be so marked in accordance with Section 11 of this Standard Practice. Flange ratings other than those listed
46、 in the flange standards in Annex B are outside the scope of this Standard Practice. 4.4 Flange Bolting 4.4.1 Cast iron, ductile iron, and non-ferrous valves with threaded body flange bolt holes shall have these holes drilled and tapped in accordance with ASME B1.1, Coarse Thread Series, Class 2B. 4
47、.4.2 Steel valves, all classes, with threaded body flange bolt holes intended for use with alloy steel bolting shall be drilled and tapped in accordance with ASME B1.1, Coarse Thread Series, Class 2B for bolts 1 in. and smaller, and shall be tapped to the 8-Thread Series, Class 2B for bolts 118in. a
48、nd larger. MSS STANDARD PRACTICE SP-674 4.4.3 Steel valves limited by use of organic materials of construction to service temperatures below 500 F (260 C) where carbon steel bolting can be used, may be tapped in accordance with ASME B1.1, Coarse Thread Series, Class 2B for all bolt sizes. 4.5 Stems
49、Stem retention and strength shall meet the requirements of ASME B16.34. The design shall not rely on actuation components (e.g., gear operators, actuators, levers, etc.) to prevent ejection. 4.6 Retention by Stem Seal Element Valves shall be designed so that the stem seal retaining fasteners (e.g., packing gland fasteners) alone do not retain the stem. Specifically, the design shall be such that the stem shall not be capable of removal from the valve while the valve is under pressure by the removal of the stem seal retainer (e.g., gland) alone. 4.7 Retention by C
