1、 MSS SP-85-2011 Gray Iron Globe and Angle Valves, Flanged and Threaded EndsStandard 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:
2、infomss-hq.org www.mss-hq.org MSS MSS STANDARD PRACTICE SP-85i 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
3、 provide an effective, clear, 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 Practic
4、e does not in itself preclude 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
5、 power, nor does it undertake, 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
6、 indicated otherwise within 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
7、the validity of those other 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.
8、MSS shall not be held responsible 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
9、 construed to be essential 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 re
10、quirements. U.S. customary units in this Standard Practice are the standard; (SI) metric units are for reference only. This Standard Practice has been substantially revised from the previous 2002 edition. It is suggested that if the user is interested in knowing what changes have been made, that dir
11、ect page by page comparison should be made 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.
12、Credit lines should read Extracted from MSS SP-85-2011 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 grante
13、d by the Manufacturers Standardization Society of the Valve and Fittings Industry Inc. All rights reserved. Originally Approved: April 1976 Originally Published: June 1976 Current Edition Approved: August 2010 Current Edition Published: October 2011 MSS is a registered trademark of Manufacturers Sta
14、ndardization Society of the Valve and Fittings Industry, Inc. Copyright , 2011 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-85ii FOREWORD The 2002 edition of MSS SP-85 changed the title and material identification throug
15、hout the Standard Practice from cast iron to gray iron, added a Forward, added nominal size designation in DN, and deleted construction designations. This 2011 edition of MSS SP-85, in addition to various editorial and formatting updates, includes changes to: (1) delete the nominal size designation
16、in DN in Section 2.4; (2) revise Section 4.5 involving handwheel materials; (3) revise Section 4.6 involving bolting; (4) add a minimum wall thickness requirement for the valve body and bonnet (new Section 5.2) and renumber the rest of Section 5; (5) revise and correct Section 5.3.1 (old 5.2.1) invo
17、lving end flanges; (6) revise Section 5.14 (old 5.13) involving bypass and drain connections; (7) revise Section 7.1 involving tests; (8) revise Sections 7.3 and 7.4 involving hydrostatic and gas seat tests and clarify the leakage rate in Section 7.4; (9) correct information in Table 1; and (10) upd
18、ate the organizations and references in Annex C. MSS STANDARD PRACTICE SP-85iii TABLE OF CONTENTS SECTION PAGE 1 SCOPE . 1 2 VALVE TYPES, CLASSES, TRIMS, AND SIZES . 1 3 PRESSURE-TEMPERATURE RATINGS . 1 4 MATERIALS . 2 5 DESIGN . 2 6 WORKMANSHIP . 3 7 TESTS 3 8 MARKING 4 9 PAINTING . 4 TABLE 1 Press
19、ure-Temperature Ratings, Non-Shock, psi 1 2 Shell Test Pressure, Minimum . 4 3 Test Duration, Minimum . 4 B1 Pressure-Temperature Ratings, Non-Shock, bar 7 FIGURE A1 Type I Globe, Metal-to-Metal Seat . 5 A2 Type II Angle, Metal-to-Metal Seat 5 A3 Type III Globe, Composition-to-Metal Seat . 6 A4 Type
20、 IV Angle, Composition-to-Metal Seat . 6 ANNEX A Valve Types Figures A1 through A4 . 5 B SI (Metric) Units . 7 C Referenced Standards and Applicable Dates 8 MSS STANDARD PRACTICE SP-851 GRAY IRON GLOBE AND ANGLE VALVES, FLANGED AND THREADED ENDS 1. SCOPE 1.1 This Standard Practice covers gray iron g
21、lobe and angle valves with flanged and threaded ends. 1.2 These valves are suitable within the sizes and pressure-temperature ratings specified herein for general purpose service. 1.3 This Standard Practice also includes, directly or by reference, stipulations or chemical and physical properties of
22、materials, and dimensions of end connections in common use. 2. VALVE TYPES, CLASSES, TRIM, AND SIZES 2.1 Valve Types Type I Globe, Metal-to-Metal Seat (See Figure A1) (1)Type II Angle, Metal-to-Metal Seat (See Figure A2)(1)Type III Globe, Composition-to- Metal Seat (See Figure A3)(1)Type IV Angle, C
23、omposition-to-Metal Seat (See Figure A4)(1)2.2 Trims a) All Bronze b) All Iron c) Bronze with Ferrous Stem d) Composition Disc 2.3 Classes 125 250 2.4 Nominal Pipe Sizes a) 2 NPS 12 flanged end b) 2 NPS 6 threaded end 3. PRESSURE-TEMPERATURE RATINGS 3.1 Pressure-temperature ratings for the various c
24、lasses of valves are shown in Table 1. SI (metric) units are shown in Table B1 in Annex B. The ratings specified are for valves with metal-to-metal seating surfaces. Pressure-temperature ratings for valves with non-metallic seat materials shall be limited to reflect the physical characteristics of t
25、hese materials at each temperature, and may be lower, but in no case higher than values shown in Tables 1 and B1. TABLE 1 Pressure-Temperature Ratings, Non-Shock, psi Temperature (F) Class 125 Class 250 -20 to 150 200 500 200 190 460 225 180 440 250 175 415 275 170 395 300 165 375 325 155 355 350 15
26、0 335 375 145 315 400 140 290 425 130 270 450 125 250 Note: See Table B1 for SI (metric) units Note: (1) The figures in Annex A are for the purpose of illustration and nomenclature only. They are not intended to exclude any design meeting this Standard Practice. MSS STANDARD PRACTICE SP-852 3.2 The
27、temperature shown for the corresponding rating shall be the metal temperature of the pressure retaining parts. It shall be assumed that the metal temperature will be the temperature of the contained fluid. Use of a pressure rating at a metal temperature other than that of the contained fluid shall b
28、e the responsibility of the user. 4. MATERIALS 4.1 General This Standard Practice covers minimum physical and chemical requirements. Users are cautioned against applications with fluids which may react chemically with any materials used in these valves. Consultation with the manufacturer is advised
29、to determine suitability in cases of doubt. 4.2 Body and Bonnet Body and bonnet shall be gray iron in accordance with ASTM A126, Class B. 4.3 Seating Material Metal-to-Metal surfaces shall be bronze for bronze trim valves; gray iron or other ferrous material for all iron valves. Composition or resil
30、ient facing material shall be rubber (synthetic or natural) or suitable polymer. Other materials, suitable for the intended service, may be furnished when agreed between purchaser and manufacturer. 4.4 Stems Stem material shall be brass or bronze; either cast or wrought for bronze mounted and compos
31、ition disc valves; and wrought steel for all iron valves. 4.5 Handwheels Handwheels may be gray iron, malleable iron, or steel, at the manufacturers option. 4.6 Bolting Bolts and studs connecting pressure containing parts shall develop mechanical properties not less than the requirements of ASTM A30
32、7, over the temperature range for which the valve is rated. 4.7 Glands Glands shall be made from brass, bronze, gray iron, or other ferrous materials. 5. DESIGN 5.1 General When under the test pressure specified in Section 7, valves shall be designed to prevent permanent distortion of the body, bonn
33、et, or seats. Valve stems shall be designed to prevent permanent distortion when valve is operated at full rated working pressure. 5.2 Minimum Wall Requirements Valve bodies and bonnets shall meet the minimum wall thickness requirements specified in ASME B16.1 for the same NPS and Class gray iron fi
34、tting. 5.3 End Flanges 5.3.1 End flanges shall be integral with the valve body. Dimensions, tolerances, and drilling shall be in accordance with ASME B16.1 for each NPS and for each respective pressure class, and shall have a surface finish in accordance with MSS SP-6. 5.3.2 Face-to-Face dimensions
35、of flanged end valves shall be in accordance with ASME B16.10. 5.4 Threaded Ends Threaded end bodies may have hexagon, octagon, or round ends with ribs. Pipe ends shall be threaded with tapered pipe threads in accordance with ASME B1.20.1. 5.5 Body-Bonnet Bolting 5.5.1 Dimensions of bolts and cap sc
36、rews shall be in accordance with ASME B18.2.1; nut dimensions in accordance with ASME B18.2.2. 5.5.2 Nuts shall be threaded in accordance with ASME B1.1, Coarse Thread Series, Class 2B. 5.5.3 Bolts, studs, or cap screws shall be threaded in accordance with ASME B1.1, Coarse Thread Series, Class 2A.
37、MSS STANDARD PRACTICE SP-853 5.6 Disc Guides Discs and disc holders for valves NPS 4 and larger shall be guided to ensure that the seating surfaces of the disc and body seat are properly aligned at the point of closure. 5.7 Seating Surfaces 5.7.1 Disc seating surfaces may be integral or may be separ
38、ate rings securely fastened to the disc. 5.7.2 Body seats shall be separate rings, threaded into the body, either shoulder or bottom seated, except that all iron valve seats may be integral with the body casting at the manufacturers option. 5.8 Glands 5.8.1 Glands may be threaded or bolted type. 5.8
39、.2 Bolted glands may be solid, solid-bushed, or two piece self-aligning design. Use of open bolt slots in glands shall not be permitted unless hinge or eye bolts are used. 5.8.3 Stem seals not requiring a gland but suitable for the service conditions, may be furnished. 5.9 Gland Bolting Studs, stud
40、bolts, hinge bolts, or headed bolts through drilled or slotted holes in the stuffing box flange may be used. In all cases gland bolting shall be securely held in place and shall provide adequate adjustment for progressive compression of packing material. 5.10 Backseat Valves shall be designed to hav
41、e a backseat. Repacking under pressure is hazardous and is not recommended. 5.11 Discs and Disc Holders Discs or disc holders shall be securely attached to the end of the stems in a manner that permits the disc to swivel relative to the stem. 5.12 Stems The upper ends of stems shall be threaded with
42、 single or multiple Acme type or 60-degree thread approximating the stub form. 5.13 Handwheels Handwheels shall be of the spoke type only. Webbed or disc type are not permitted. Handwheels shall be marked with the direction of movement for opening of the valve. On large size valves to be used at or
43、near maximum rated pressures, the manufacturer should be consulted regarding the use of auxiliary operating means. 5.14 Bypass and Drain Connections Unless otherwise specified by a purchaser, bypass and drain connections shall be in accordance with MSS SP-45. 6. WORKMANSHIP 6.1 General Valve parts s
44、hall be designed and manufacturing tolerances set so as to provide interchangeability in the product of any one manufacturer between units of the same size, class, type, and design; except the individual fit of the disc-to-seat ring seating surfaces of Type I and II valves. 6.2 Castings All castings
45、 shall be clean and sound, without defects which will impair their service. Plugging, impregnation, welding, or other repairing of defects is not allowed. 7. TESTS 7.1 General A shell test and a seat test shall be made on all completed valves prior to shipment by the manufacturer. 7.2 Shell Test Val
46、ves in the partially open position with both ends closed shall be subjected to hydrostatic or gas test pressure specified in Table 2. No visible leakage is permitted through the pressure boundary walls or body-bonnet joint. Leakage through the stem packing or stem seals shall not be cause for reject
47、ion. Test pressure shall be held for the duration specified in Table 3. Caution: Safety precautions must be taken when gas is used. MSS STANDARD PRACTICE SP-854 TABLE 2 Shell Test Pressure, Minimum Max. Service Rating 150 F Test Pressure psi bar psi bar 200 13.8 350 24.1 500 34.5 875 60.3 7.3 Hydros
48、tatic Seat Test Valves shall be subjected to a hydrostatic seat test pressure at not less than the maximum service pressure for which the valve is rated. The test pressure shall be applied under the closed disc and the opposite side shall be checked for leakage. The maximum permissible leakage rate
49、shall be 10 ml/hr/NPS. Test pressure shall be held for the duration specified in Table 3. Leakage is not permitted for composition disc valves. 7.4 Gas Seat Test At the manufacturers option a gas seat test of not less than 80 psi (5.5 bar) may be used in lieu of a Hydrostatic Seat Test (see Section 7.3). This gas pressure is to be applied as specified for a hydrostatic seat test. The maximum permissible leakage rate shall be 0.1 std ft3/hr/NPS (2.8 l/hr/NPS). Test pressure shall be held for the duration specified in Table 3. Leakage is not permitt
