MSS-SP-80-2008.pdf

《MSS-SP-80-2008.pdf》由会员分享，可在线阅读，更多相关《MSS-SP-80-2008.pdf（34页珍藏版）》请在三一文库上搜索。

1、 MSS SP-80-2008 Bronze Gate, Globe, Angle, and 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 Phone: (703) 281-6613 Fax: (703) 281-6671 E-mail infomss.hq.org www.ms

2、s-hq.org MSS STANDARD PRACTICE SP-80 i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 203 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,

3、 clear, and non-exclusive specification that will 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,

4、 or use of products not conforming to the Standard 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

5、 issue that was applicable to the referenced standard(s) at the date of issue of this MSS SP. (See Annex C.) U.S. customary units in this SP are the standard; the metric units are for reference only. This document has been substantially revised from the previous 2003 edition. It is suggested that if

6、 the user is interested in knowing what changes have been made, that direct page-by-page comparison should be made of this document with the previous edition. Any part of this Standard Practice may be quoted. Credit lines should read Extracted from MSS SP-80, 2008 with permission of the publisher, t

7、he Manufacturers 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 November, 1974 Copyright , 2003 by Manufacturers Standardization

8、Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. -,-,- MSS STANDARD PRACTICE SP-80 ii TABLE OF CONTENTS SECTION PAGE 0 PURPOSE. 1 1 SCOPE AND VALVE TYPES 1 2 PRESSURE-TEMPERATURE RATINGS 2 3 MATERIALS . 4 4 DESIGN 4 5 MARKINGS. 13 6 TOLENRANCE 13 7 INSPECTION AND TESTING 13 TABLE 1

9、 Pressure-Temperature Ratings 3 2 List of Material Specifications 5 3 Minimum Length and Depth of Thread 8 4 Bronze Gate Valves-Diameter of Stem. 11 5 Bronze Globe and Angle Valves-Diameter of Stem. 11 6 Bronze Gate Valves - Diameter of Handwheel. 12 7 Bronze Globe and Angle Valves-Diameter of Handw

10、heel. 12 8 Shell Test-Threaded and Solder End Valves 13 9 Shell Test-Flanged End Valves. 13 10 Seat Test-Threaded and Solder End Valves 14 11 Seat Test-Flanged End Valves 14 A1 Pressure-Temperature Limitations 15 X1-1 Pressure-Temperature Limitations 25 X1-2 Pressure-Temperature Ratings 26 X1-3 Mini

11、mum Length and Depth of Thread 27 X1-4 Bronze Gate Valves-Diameter of Stem. 28 X1-5 Bronze Globe and Angle Valves-Diameter of Stem. 28 X1-6 Bronze Gate Valves-Diameter of Handwheel. 29 X1-7 Bronze Globe and Angle Valves-Diameter of Handwheel. 29 X1-8 Shell Test-Threaded and Solder End Valves 30 X1-9

12、 Shell Test-Flanged End Valves. 30 X1-10 Seat Test-Threaded and Solder End Valves 30 X1-11 Seat Test-Flanged End Valves 30 FIGURE B1 Gate Valve-Type 1A, Solid Wedge, Non-Rising Stem, External Stuffing Box . 16 B2 Gate Valve-Type 1B, Solid Wedge, Non-Rising Stem, Internal Retaining Nut. 16 B3 Gate Va

13、lve-Type 2, Solid Wedge, Inside Screw, Rising Stem. 17 B4 Gate Valve-Type 3, Split Wedge (Double Disc), Inside Screw, Rising Stem 18 B5 Gate Valve-Type 4, Double Disc, Parallel Seat, Inside Screw, Rising Stem 18 B6 Globe and Angle Valves-Type 1, Metal Disc, Integral Seat. 19 B7 Globe and Angle Valve

14、s-Type 2, Non-Metal Disc, Integral Seat. 19 B8 Globe and Angle Valves-Type 3, Metal Disc, Removable Seat. 20 B9 Check Valve-Type 1, Horizontal Lift Check - Metal to Metal Seat . 21 B10 Check Valve-Type 1, Angle Lift Check - Metal to Metal Seat. 21 B11 Check Valve-Type 2, Horizontal and Angle Lift Ch

15、eck - Non-Metallic to Metal Seat 22 B12 Check Valve-Type 2, Vertical Lift Check - Non-Metallic to Metal Seat . 22 B13 Check Valve-Type 3, Swing Check, Metal to Metal Seat 23 B14 Check Valve-Type 4, Swing Check, Non-Metallic Disc to Metal Seat 23 ANNEX A Strength of Solder Joints. 15 B Valve Types 16

16、 C Referenced Standards and Applicable Dates 24 X1 Metric References. 25 MSS STANDARD PRACTICE SP-80 1 0. PURPOSE This MSS Standard Practice establishes requirements for bronze gate, globe, angle, and check valves in Classes 125 (PN 20), 150, 200, 300 (PN 50) and 350 for threaded and solder ends and

17、 Classes 150 (PN 20) and 300 (PN 50) for flanged ends. Pressures in this Standard Practice are gauge pressure in pounds per square inch (Kilopascals). Hereafter the pressure will appear as psi (kPa). 1. SCOPE AND VALVE TYPES 1.1 Scope This Standard Practice establishes requirements for bronze gate,

18、globe, angle, and check valves for general purpose services and provides requirements for the following: a) Pressure-Temperature Ratings b) Materials c) End Connections d) Dimensions e) Markings f) Testing and Inspections 1.2 Valve Types 1.2.1 Gate Valves a) Type 1A Solid Wedge: Non-Rising Stem (NRS

19、), External Stuffing Box for Stem Retention Fig. B1, Annex B. b) Type 1B Solid Wedge: Non-Rising Stem (NRS), Internal Stem Retaining Nut for Stem Retention Fig. B2, Annex B. c) Type 2 Solid Wedge: Inside Screw, Rising Stem (ISRS) Fig. B3, Annex B. d) Type 3 Split Wedge (Double Disc): Inside Screw, R

20、ising Stem, (ISRS) Fig. B4, Annex B. e) Type 4 Double Disc: Parallel Seat, Inside Screw, Rising Stem (ISRS) Fig. B5, Annex B. 1.2.2 Globe and Angle Valves a) Type 1 Metal Disc, Integral Seat Fig. B6, Annex B. b), Type 2 Non-Metallic Disc, Integral Seat Fig. B7, Annex B. c) Type 3 Metal Disc, Removab

21、le Seat Fig. B8, Annex B. 1.2.3 Check Valves a) Type 1 Horizontal, Lift Check, Metal Disc to Metal Seat Figure B9, Annex B. b) Type 2 Horizontal, Angle, and Vertical Lift Check, Non-Metallic Disc to Metal Seat Figs. B11 however, repacking while the valve is pressurized is not recommended. 4.4 Discs

22、and Seat Rings 4.4.1 Discs and Seat Rings for Bronze Gate Valves 4.4.1.1 Solid-wedge discs shall be of one-piece construction with disc guides. The stem chamber of the NRS discs shall be open at the bottom for proper drainage. 4.4.1.2 Split wedge and parallel seat discs (double disc) shall be design

23、ed so, that on reaching the point of closure, thrust from the stem will cause the disc to seat. 4.4.1.3 All discs shall have machined seating- surfaces and shall be securely attached to the stem in all operating positions. 4.4.1.4 Seats may have expanded-in, threaded-in, or otherwise renewable seat-

24、rings or may be cast integral with the body at the manufacturers option. 4.4.2 Discs and Seat Rings for Bronze Globe and Angle Valves 4.4.2.1 Discs or disc holders shall be fastened securely to the end of the stem in such a manner as to allow these parts to swivel freely. Valve Types 1 and 2 in size

25、s 1/2 (DN 15) and smaller, may have the disc or disc holder formed on the end of the stem. Discs, plugs, or disc holders of the slip-on type shall be adequately guided for self-centering and shall be so constructed, in relation to body and bonnet, that when the valve is fully opened, they will not s

26、lip off the stem. Disc holders for Type 2 Valves shall be designed to contain the periphery of the non- metallic disc in position. 4.4.2.2 The seat may have an expanded-in, threaded-in, or otherwise renewable seat ring, or may be cast integral with the body at the manufacturers option. MSS STANDARD

27、PRACTICE SP-80 10 4.4.3 Discs and Seats for Bronze Check Valves 4.4.3.1 Bronze check valves, Types 1 and 2, shall have the disc or disc holder substantially guided to ensure proper seating. 4.4.3.2 Bronze check valves, Types 3 and 4, shall have disc and disc holder fastened securely to the hanger or

28、 hinge. The connection shall allow sufficient freedom so that the disc will properly seat by gravity. The joint shall swivel freely to allow uniform wear, except that disc or disc holders and hanger may be integral in Class 125 valves. 4.4.3.3 Disc holders for bronze check valves, Types 2 and 4, sha

29、ll be designed to hold and support the non-metallic disc. 4.4.3.4 The seat may have an expanded-in, threaded-in, or otherwise renewable seat ring, or may be cast integral with the body at the manufacturers option. 4.5 Stems for Bronze Gate Valves, and Bronze Globe and Angle Valves Stems shall be thr

30、eaded with either Acme form threads or 60 truncated “V“ threads, so that the valve will be opened when the handwheel is rotated counter-clockwise. The handwheel end of the stem shall be a tapered square with its greatest diagonal equal approximately to the diameter of the stem or it may be of the sp

31、lined or serrated design of equal strength. A threaded extension shall be provided to accommodate a handwheel nut. The handwheel nut may be brass or, if made of steel, it shall have a corrosion protective plating. The diameter of that portion of the stem passing through the packing shall not be less

32、 than shown in Tables 4 (Table X1-4) and 5 (Table X1-5). 4.6 Packing Box and Packing Nut for Bronze Gate Valves and Bronze Globe and Angle Valves 4.6.1 Packing box for Class 125 (PN20) valves may be of gland-follower type or packing-nut type. Packing boxes for all other valves, sizes greater than 1/

33、2 inch (DN15), shall be of the gland-follower type. The length of packing in contact with the stem shall be at least one diameter of the stem passing through it. The thread of the packing nut shall be of sufficient length to enable the nut to be threaded on to the packing box or bonnet at least two

34、full threads, when the full amount of packing is in place, and the length of thread engagement between the packing box or bonnet and the packing nut shall be sufficient for full travel of the gland. 4.6.2 Stem Packing - Stem packing shall be braided, twisted, or formed ring type made from non- asbes

35、tos material, suitable for the pressure- temperature ratings of the valve. 4.7 Handwheels for Bronze Gate, Globe, and Angle Valves Handwheels smaller than 6 inches (152mm) in diameter shall be of the non-heat design with a raised rim to protect the hands. Handwheels 6 inch (152mm) in diameter and la

36、rger, may be of the plain rim type marked to show the direction of opening. The diameter of the handwheel shall not be less than shown in Tables 6 (Table X1-6) and 7 (Table X1-7). All handwheels shall have at least three spokes. MSS STANDARD PRACTICE SP-80 11 TABLE 4 Bronze Gate Valves Diameter of S

37、tem DIAMETER OF STEM MINIMUM Nominal CLASS Valve 125 150 200 300 & 350 Size Inches Inches Inches Inches 1/4 0.25 0.29 0.31 0.31 3/8 0.28 0.29 0.31 0.31 1/2 0.31 0.31 0.34 0.34 3/4 0.35 0.35 0.38 0.38 1 0.39 0.40 0.40 0.40 1-1/4 0.42 0.43 0.44 0.44 1-1/2 0.48 0.48 0.50 0.50 2 0.53 0.53 0.53 0.53 2-1/

38、2 0.59 0.59 0.61 0.61 3 0.67 0.67 0.70 0.70 TABLE 5 Bronze Globe and Angle Valves Diameter of Stem DIAMETER OF STEM MINIMUM Nominal CLASS Valve 125 150 200 300 & 350 Size Inches Inches Inches Inches 1/4 0.24 0.28 0.28 0.28 3/8 0.28 0.28 0.28 0.28 1/2 0.31 0.35 0.35 0.35 3/4 0.35 0.39 0.40 0.40 1 0.3

39、9 0.42 0.44 0.44 1-1/4 0.42 0.49 0.50 0.50 1-1/2 0.49 0.53 0.53 0.53 2 0.53 0.59 0.62 0.62 2-1/2 0.59 0.67 0.67 0.67 3 0.67 0.75 0.75 0.75 MSS STANDARD PRACTICE SP-80 12 TABLE 6 Bronze Gate Valves Diameter of Handwheel DIAMETER OF HANDWHEEL MINIMUM Nominal CLASS Valve 125 150 200 300 & 350 Size Inch

40、es Inches Inches Inches 1/4 1.62 1.75 2.00 2.00 3/8 1.62 1.75 2.00 2.00 1/2 1.88 2.00 2.25 2.25 3/4 2.25 2.50 2.50 2.50 1 2.62 2.62 2.75 2.75 1-1/4 3.00 3.00 3.25 3.25 1-1/2 3.25 3.50 3.62 3.62 2 3.62 4.00 4.00 4.00 2-1/2 4.38 4.62 4.62 4.62 3 5.00 5.00 5.50 5.50 When irregular handwheels are furnis

41、hed, the largest dimension of the shape shall be considered the handwheel diameter. TABLE 7 Bronze Globe and Angle Valves Diameter of Handwheel DIAMETER OF HANDWHEEL MINIMUM Nominal CLASS Valve 125 150 200 300 & 350 Size Inches Inches Inches Inches 1/4 1.50 1.75 1.75 1.75 3/8 1.75 2.00 2.00 2.00 1/2

42、 2.00 2.25 2.50 2.50 3/4 2.50 2.62 2.75 2.75 1 2.75 3.00 3.00 3.00 1-1/4 3.00 3.50 3.50 3.50 1-1/2 3.50 3.75 4.00 4.00 2 4.00 4.38 4.75 4.75 2-1/2 4.75 5.00 5.38 5.38 3 5.38 5.75 6.00 6.00 When irregular handwheels are furnished, the largest dimension of the shape shall be considered the handwheel d

43、iameter. MSS STANDARD PRACTICE SP-80 13 5. MARKINGS 5.1 All valves shall be marked in accordance with the requirements of MSS SP-25. 5.2 All bronze check valve bodies shall be marked to indicate the direction of flow by means of an arrow cast on the valve body or the word “in“ or “inlet“ cast or sta

44、mped on the inlet end of the body. 6. TOLERANCE 6.1 Tolerance specified in the standards referenced for dimensions shall be applied to these valves. 7 INSPECTION AND TESTING 7.1 Function - All valve parts shall be made within inspection limits to ensure ready inter- changeability of parts. 7.2 Certi

45、fication - Manufacturers shall be prepared to certify that their products meet the minimum requirements of this Standard Practice. 7.3 Pressure Test 7.3.1 Shell Test - Each valve assembly shall be given a hydrostatic or pneumatic shell test as specified in Tables 8 (Table X1-8) and 9 (Table X1-9). N

46、o visible leakage is permitted in the valve pressure boundary except at the stem packing (when adjustable) or test connection seals. TABLE 8 Shell Test Threaded and Solder-End Valves SHELL TEST PRESSURE-MINIMUM Air Water Class CWP psi psi 125 200 80 300 150 300 80 450 200 400 80 600 300 600 80 900 3

47、00 (a) 1000 80 1500 350 1000 80 1500 (a) See Table 1, Note e TABLE 9 Shell Test Flanged-End Valves SHELL TEST PRESSURE-MINIMUM Air Water Class CWP psi psi 150 225 80 350 300 500 80 750 -,-,- MSS STANDARD PRACTICE SP-80 14 7.3.2 Seat Test 7.3.2.1 Each gate, globe, and angle valve shall be given a hyd

48、rostatic or pneumatic seat-test as specified in Tables 10 (Table X1-10) and 11 (Table X1-11). The maximum permissible leakage rate shall be 10 ml of water per hour per inch (25mm) of diameter of nominal valve size or 0.1 ml of a standard cubic foot of air per hour (50 standard ml of air per minute)

49、per inch (DN 25) of diameter of nominal valve size for valves in sizes NPS 1 (DN 25) and larger. For valves in sizes smaller than NPS 1 (DN 25), the maximum permissible leakage rate shall be 10 ml of water per hour or 0.1 of a standard cubic foot of air per hour (50 standard ml of air per minute). 7.3.2.1.1 In the case of valves having a seat closure member that uses a resilient material, e.g., plastic or elastomer, for fluid sealing at closure, there sh