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1、MSS SP-67-2002a 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 Phone: (703) 281-6613 www.mss- . Fax: (703) 281-6671 e-mail: MSS STANDARD PRACTICE SP-67 This MS
2、S Standard Practice was developed under the consensus of MSS Technical Committee 407 and the MSS Coordinating Committee. The content of this Standard Practice is the result of the efforts of competent and concerned volunteers to provide an effective, clear, and non-exclusive specification that will
3、benefit the industry as a whole. This MSS Standard Practice 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 manufacture, sale or use of products not conforming to the Standard
4、Practice. Mandatory conformance is established only by reference in a code, specification, sales contract, or public law, as applicable. Unless otherwise specifically noted in this MSS SP, any standard referred to herein is identified by the date of issue that was applicable to the referenced standa
5、rd(s) at the date of issue of this MSS SP. (See Annex B). U. S. customary units in this SP are the standard; the metric units are only for reference only. Any part of this standard may be quoted. Credit lines should read Extracted from MSS SP-67, 2002a, with permission of the publishe the Manufactur
6、ers Standardization Society. Reproduction prohibited under copyright convention unless written permission is granted by the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Originally Approved December 1964 Copyright O, 1983 by Manufacturers Standardization Society of t
7、he Valve and Fittings Industry, Inc. Printed in U. S. A. i MSS STANDARD PRACTICE SP-67 TABLE OF CONTENTS SECTION 1 2 3 4 5 6 7 8 9 10 11 SCOPE 1 DEFINITIONS . 1 STANDARD ENDS 1 DESIGN REQUIREMENTS . 1 VALVE DISC CLEARANCE 3 TRIM . 3 FACE-TO-FACE DIMENSIONS . 3 ACTUATORS 4 PURCHASING INFORMATION 4 PR
8、ODUCTION TESTING 5 MARKING . 5 TABLE 1 Pipe Minimum Diameter for Disc Clearance . 6 Face-to-Face Dimensions, Flanged End Valves . 7 End-to-End Dimensions, Grooved End Valves . 9 2 3 4 Face-to-Face Dimensions, Single Flange and Flangeless Valves 8 FIGURE 1 Face.to.Face. Flangeless. and Single Flange
9、Valves 10 2 3 4 5 6 7 Flanged Ends. Bolting Options 11 Single Flanged, Bolting Options 11 Flangeless, Bolting Options . 11 End-to-End, Grooved End Valves 12 Shouldered End Valves 12 Disc to Pipe Minimum Clearance, Typical Concentric Type Construction . 13 ANNEX A Disc to Pipe Clearance 14 TABLE Al D
10、isc to Pipe Minimum Clearances 14 ANNEX B Referenced Standards and Applicable Dates 15 11 -,-,- MSS STANDARD PRACTICE SP-67 1, SCOPE 1.1 This Standard Practice covers dimensions, design, testing, and marking requirements for but- terfiy valves. Further reference should be made to the MSS SP-68. 1.2
11、This Standard Practice covers two types of butterfy valves: Type I - Valves for tight shut-off (tested per subsection 10.2.1). Type II - Valves permitting seat leakage (see subsection 103.2) 1.3 This Standard Practice covers flangeless (wa- fer-type), single flange (lug-type), and flanged end valves
12、 in sizes 1 112 NPS thru 72 NPS, grooved end valves, and shouldered end valves with pres- sure 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 dimension of the valve face-to-face be- fore it is installed in th
13、e pipe line. It does not in- clude 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. 2.2 Face-to-Face of Valve Installed This is the dimen
14、sion of the valve face-to-face after it is in- stalled in the pipe line. It does not include the thick- ness 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 se
15、als compressed. See Fig. IA, IB, IC and Table 3. 2.3 Face-to-Face of Valve and Gaskets In- stalld This is the dimension of the valve face- to-face including separate gaskets when installed in the pipe line. This dimension must be estab- lished using the thickness of the valve face-to-face dimension
16、and the compressed thickness of the gaskets to be used in such installations. 3. 4. 1 2.4 CWP - Cold Working Pressure (PUG). The pressure rating for the pressure containing compo- nents of the valve at temperatures up to and includ- ing 100OF. 2.5 System Pressure. Maximum specified operat- ing press
17、ure for the application. 2.6 Differential Pressure. The difference in pres- sure between two points located on opposite sides of the valve disc. 2.7 Shut-Off Pressure. The maximum differen- tial pressure with the valve in the fully closed posi- tion. STANDARD ENDS 3.1 Flanged Ends. Valves shall be c
18、ompatible for use with flanges to ASME B16.1 Class 25 or 125, ASME B 16.5 Class 150, ASME B16.47 Class 150 Series A, ASME B 16.24 Class 150, ASME B 16.42 Class 150 or ANSI/AWWA C207. Figure 2 illus- trates bolting options. 3.2 Single Flange (Lug Type). Valves shall be compatible for use with flanges
19、 to ASME B 16.1 Class 25 or 125, ASME B16.5 Class 150, ASME B16.24 Class 150, ASME B16.42 Class 150, or ANSI/ AWWA C207. Figure 3 illustrates bolting options. 3.3 Ftangeless (Wafer Type). Valves shall be com- patible foruse with flanges to ASME B16.1 Class 25 or 125, ASME B16.5 Class 150, ASME B16.2
20、4 Class 150, ASME B16.42 Class 150, or ANSI/ AWWA C207. Figure 4 illustrates bolting options. 3.4 Grooved Ends. Valve ends shall conform to ANSIIAWWA C606. 3.5 Shouldered Ends. Valve ends shall conform to ANSIIAWWA C606. DESIGN REOUIREMENTS 4.1 Wall Thickness. The design requirements of this section
21、 apply only to the valve body. The disc and shaft are specifically excluded. -,-,- MSS STANDARD PRACTICE SP-67 4.1.1 Steel, NickeIAIIoy and other SpecialAlloy vidves. 4.1.1.1 Valves that conform to the applicable re- quirements of ASME B 16.34 shall have body pres- sure-temperature ratings in accord
22、ance with that standard. For valves that do not conform to the applicable requirements of ASME B 16.34,4.1.1.2 or 4.1.1.3 shall be used to determine the minimum required wail thickness. 4.1.1.2 Valves that do not conform to the appli- cable requirements of ASME B 16.34 shall have their minimum wall
23、thickness determined using the following equation: Pd 2s - 1.2P t = 1.5 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, psi The allowable stress shall be taken
24、 from the ASME Boiler and Pressure Vessel Code, Section 1 (or if not listed, use Section VIII, Division 1). If the material is not listed in either of these Code sec- tions then the allowable stress shall be determined using the method of Appendix P of Section VIII. For cast materials use the approp
25、riate casting qual- ity factor from UG-24 of Section VIII. 4.1.1.3 As an alternative to 4.1.1.2, valves that do not conform to the applicable requirements of ASME B16.34 shall have the maximum allow- able pressure determined using a proof test in ac- cordance with UG- 1 O 1 of ASME Section VIII. 4.1
26、.2 Bronze and Bronze Alloy Valves. 4.1.2.1 Valves that conform to the applicable re- quirements of ASME B 16.24 shall have body pres- sure-temperature ratings in accordance with that standard. For valves that do not conform to the applicable requirements of ASME B16.24,4.1.2.2 or 4.1.2.3 shall be us
27、ed to determine the minimum required wall thickness. 4.1.2.2 Valves that do not conform to the appli- cable requirements of ASME B16.24 shall have the minimum wall thickness determined using methods that result in designs that are as conser- vative as those used in that standard. 4.1.2.3 As an alter
28、native to 4.1.2.2, valves that do not conform to the applicable requirements of ASME B 16.24 shall have the maximum allow- able pressure determined using a proof test in ac- cordance with UG-1 O1 of ASME Section VIII. 4.1.3 Cast Iron Valves. 4.1.3.1 Valves that conform to the applicable re- quiremen
29、ts of ASME B16.1 or ANSUAWWA C504 shall conform to the body pressure-tempera- ture requirements in accordance with the respec- tive standard. For valves which do not conform to the applicable requirements of ASME B 16.1 or ANSUAWWA C504, Sections 4.1.3.2 or 4.1.3.3 shall be used to determine the min
30、imum required wall thickness. 4.1.3.2 Valves that do not conform to the appli- cable requirements of ASME B 16. I or ANSI/ AWWA C504 shall have the minimum wall thick- ness determined using methods that result in de- signs that are as conservative as those used in these standards. 4.1.3.3 As an alte
31、rnative to 4.1.3.2, valves that do not conform to the applicable requirements of ASME B16.1 or ANSIAWWA C504 shall have the maximum allowable pressure determined us- ing a proof test in accordance with UCI-101 of ASME Section VIII. 4.1.4 Ductile Iron Valves. 4.1.4.1 Valves that conform to the applic
32、able re- quirements of ASME B16.42 or ANWAWWA C504 shall conform to the body pressure-tempera- ture requirements in accordance with the respec- tive standard. For valves that do not conform to 2 -,-,- MSS STANDARD PRACTICE SP-67 the applicable requirements of ASME B 16.42 or ANWAWWA C504, Sections 4
33、.1.4.2 or 4.1.4.3 shall be used to determine the minimum required wall thickness. 4.1.4.2 Valves that do not conform to the appli- cable requirements of ASME B 16.42 or ANSI/ AWWA C504 shall have the minimum wall thick- ness determined using methods that result in de- signs that are as conservative
34、as those used in these standards. Reference Annex C of ASME B16.42. 4.1.4.3 As an alternative to 4.1.4.2, valves that do not conform to the applicable requirements of ASME B16.42 or ANSI/AWWA C504 shall have the maximum allowable pressure determined us- ing a proof test in accordance with UCD-101 of
35、 ASME Section VIII. 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 thick- ness of the body neck. 4.2 Flange Thickness. If materials other than those listed in the flange
36、 standards in Section 2 are used for flanged end valves, the minimum flange thickness shall be determined using meth- ods that are as conservative as those used in the standard appropriate for the material of construc- tion. In no case shall the minimum flange thick- ness be less than that listed in
37、 the standard for the flange rating under consideration. 4.3 Pressure Rating. Valves may be designed for shut-off pressure rating or differential pres- sures lower than the body pressure rating. This pressure rating shall be so marked in accordance with Section 1 1 of this Standard Practice. Flange
38、ratings other than those listed in the flange stan- dards 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 B 1.1
39、 Coarse Thread Series Class 2B. 5. 6. 7. 3 4.4.2 Steel valves, ali classes, with threaded body flange boit holes intended for use with alloy steel bolting shall be drilled and tapped in accordance with ASME B 1.1 Coarse Thread Series Class 2B for bolts I” and smaller and shall be tapped to the 8 Thr
40、ead Series Class 2B for bolts 1-1/8” and larger. 4.4.3 Steel valves limited by use of organic mate- rials of construction to service temperatures be- low 500” F (260” c) where carbon steel bolting can be used, may be tapped in accordance with ASME B 1.1 Coarse Thread Series 2B for all bolt sizes. VA
41、LVE DISC CLEARANCE 5.1 Butterfly valve discs may upon rotation project beyond the body flange faces, and there- fore, caution should be exercised by the user to insure there is no interference between the butter- fly valve disc and adjacent components, such as lined piping, strainers, check valves,
42、and other valving. Also mating pipe flanges must be aligned prior to tightening of flange bolts. 5.2 Ali valves shall be designed for suitable clear- ance according to the pipe inside diameters shown in Table 1, and in accordance with Annex A and Figure 7. TRIM 6.1 Trim materials shall be suitable f
43、or the ser- vice conditions and shall be at the manufacturers option unless specified. Trim shall be defined as comprising shafts, bushings, body seating surfaces, discs or disc seating surfaces, internal keys, pins, and screws in contact with the line fluid. Seats in the body and on the disc may be
44、 separate or inte- gral. Seat facings may be applied to bodies a n d or discs. FACE -TO-FACE DIMENSIONS 7.1 Flanged end valves. Face-to-Face dimen- sions and tolerances for flanged end valves are listed in Table 2. MSS STANDARD PRACTICE SP-67 7.2 Flangeless (Wafer Type) Valves. Face-to- Face dimensi
45、ons and tolerances for flangeless valves are listed in Table 3. Figures 1A and 1B illustrate valves with integral seals or gaskets. Figure 1C illustrates valves that require separate gaskets. 7.3 Single Flange (Lug Type) Valves. Face-to- Face dimensions and tolerances for single flange valves are li
46、sted in Table 3. Figures IA and 1B illustrate valves with integral seals or gaskets. Figure 1 C illustrates valves that require separate gaskets. 7.4 Grooved End Valves. Grooved end valve configuration is shown in Figure 5. 7.5 Shouldered End Valves. Shouldered end valve configuration is shown in Fi
47、gure 6. 8. ACTUATORS 8.1 Actuators used with these valves shall be self locking or have provisions to prevent unwanted disc movement during normal operating conditions. 8.2 Many factors such as flow media, operating pressures, fluid velocities, and location in the pipe line affect the operating torq
48、ue of the valve. These conditions must be considered when sizing the actuator. See MSS SP-9 1 for guidelines in select- ing manual actuators. 9. PURCHASING INFORMATION 9.1 In order to enable the manufacturer to prop- erly supply valves for the application, the purchaser shall furnish the following i
49、nformation: a) Standard to be used. b) Size of valve. c) Type of valve (see Section 1). d) Type ofend connection (see Section 3). If flanged end, specifj narrow or wide, or extra wide from Table 2. e) Connecting pipe material (see Table 1). f) Body line pressure. g) Shut-off pressure (see Subsection 4.3). h) Type and temperature of line fluid to be handled. i) Flow conditions: 1. For on-off service, maximum flow. 2. For regulating service