1、 MSS SP-67-2011 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: infomss-hq.org MSS www.mss-hq.org MSS STAN
2、DARD 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-excl
3、usive 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 manufact
4、ure, 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
5、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 within this MSS Stand
6、ard 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 p
7、rior 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 iden
8、tifying 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 understa
9、nding 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 S
10、tandard Practice are the standard; (SI) metric units are for reference only. This Standard Practice has been substantially revised from the previous 2002a 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 mad
11、e of this document and that of the previous edition. Non-toleranced dimensions in this Standard Practice are nominal, and, unless otherwise specified, shall be considered “for reference only”. Excerpts of this Standard Practice may be quoted with permission. Credit lines should read Extracted from M
12、SS SP-67-2011 with permission of the publisher, Manufacturers Standardization Society of the 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 So
13、ciety of the Valve and Fittings Industry Inc. All rights reserved. Originally Published: May 1964 Current Edition Approved: March 2011 Current Edition Published: October 2011 MSS is a registered trademark of Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 2
14、011 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed 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 DIMENSIO
15、NS 4 8 ACTUATORS 4 9 PURCHASING INFORMATION . 4 10 PRODUCTION TESTING 5 11 MARKING 6 TABLE 1 Pipe Minimum Diameters for Disc Clearance . 7 2 Face-to-Face Dimensions, Flanged End Valves 8 3 Face-to-Face Dimensions, Single Flange and Flangeless Valves 9 4 End-to-End Dimensions, Grooved End Valves . 10
16、 A1 Disc-to-Pipe Minimum Clearances 15 FIGURE 1 Face-to-Face, Flangeless, and Single Flange Valves (includes 1A, 1B, and 1C) 11 2 Flanged Ends, Bolting Options 12 3 Single Flanged, Bolting Options . 12 4 Flangeless, Bolting Options . 12 5 End-to-End, Grooved End Valves . 13 6 Shouldered End Valves .
17、 13 7 Disc-to-Pipe Minimum Clearance, Typical Concentric Type Construction 14 ANNEX A Disc-to-Pipe Clearance . 15 B Reference Standards and Applicable Dates 16 MSS STANDARD PRACTICE SP-671 1. SCOPE 1.1 This Standard Practice covers dimensions, design, testing, and marking requirements for butterfly
18、valves. Further reference should be made to the MSS SP-68. 1.2 This 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-typ
19、e), single flange (lug-type), and flanged end valves in size NPS 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 Face-to-Face of Valve before Installation This is the dimensi
20、on of the valve face-to-face before it is installed in the pipe line. 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 and this dimension is before these gaskets or seals are compressed
21、. 2.2 Face-to-Face of Valve Installed This is the dimension of the valve face-to-face after it is installed in the pipe line. 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 t
22、his dimension is established with the gaskets or seals compressed. See Figure 1A, 1B, 1C, and Table 3. 2.3 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 pipe line. This dimension must be established using
23、the thickness of the valve face-to-face dimension and the compressed thickness of the gaskets to be used in such installations. 2.4 CWP - Cold Working Pressure (PSIG) The pressure rating for the pressure containing components of the valve at temperatures up to and including 100 F. 2.5 System Pressur
24、e Maximum specified operating pressure for the application. 2.6 Differential Pressure The difference in pressure between two points located on opposite sides of the valve disc. 2.7 Shut-Off Pressure The maximum rated differential pressure with the valve in the fully closed position. 3. STANDARD ENDS
25、 3.1 Flanged Ends Valves shall be compatible for use with flanges 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 shall be compat
26、ible for use with flanges 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. 3.3 Flangeless (Wafer-Type) Valves shall be compatible for use with flanges to ASME B16.1 Class 25 or 125, ASME B16.5 Class
27、 150, ASME B16.24 Class 150, ASME B16.42 Class 150, or AWWA C207. Figure 4 illustrates bolting options. 3.4 Grooved Ends Valve ends shall conform to AWWA C606. BUTTERFLY VALVES MSS STANDARD PRACTICE SP-672 3.5 Shouldered Ends Valve ends shall conform to AWWA C606. 4. DESIGN REQUIREMENTS 4.1 Wall Thi
28、ckness 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 ASME B16.34 shall have body pressure-temperature ratings i
29、n 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 Valves that do not conform to the applicable requirements o
30、f ASME B16.34 shall have their minimum wall thickness determined using the following equation: P2.1S2Pd5.1t 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 flangeless valves), in. S = Allowable stress, p
31、si 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 determined using the method contained in ASME BPV
32、C, 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 requirements of ASME B16.34 shall have the maximum all
33、owable 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-temperature ratings in accordance with that stand
34、ard. 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 applicable requirements of ASME B16.24 shall have th
35、e 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 shall have the maximum allowable pressure determin
36、ed by using a proof test in accordance with UG-101 of ASME BPVC, Section VIII, Division I. 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 to the body pressure-temperature requirements in accordance with the respective standa
37、rd. 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 thickness. 4.1.3.2 Valves that do not conform to the applicable requirements of ASME B16.1 or
38、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. MSS STANDARD PRACTICE SP-673 4.1.3.3 As an alternative to Section 4.1.3.2, valves that do not conform to the applicable requirements of ASME
39、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 requirements of ASME B16.42 or AWWA C504 shall conform to the body p
40、ressure-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 to determine the minimum required wall thickness. 4.1.4.2 V
41、alves 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. Reference Annex C of ASME B16.42. 4.1.4.3 As an alternative to Sec
42、tion 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. 4.1.5 Reduced Body Wall Thickness 4.1.5.1 The body materia
43、l 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 are used for flanged end valves, the minimum flange thickn
44、ess 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 flange rating under consideration. 4.3 Pressure Rating Valves m
45、ay 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 in the flange standards in Annex B are outside the scope
46、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. 4.4.2 Steel valves, all classes, with threaded body flange bo
47、lt 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“ and smaller and shall be tapped to the 8 Thread Series Class 2B for bolts 118“ and larger. 4.4.3 Steel valves limited by use of organic materials of
48、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 Stem retention and strength shall meet the requirements of ASME B16.34. The design shall not rely on
49、 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. MSS STANDARD PRACTICE SP-674 4.7 Retention by Closure Member Valves, including those intended for isolation,
