Butterfly Valves:

Double Flanged, Lug- and Wafer-Type

API STANDARD 609 SIXTH EDITION, MAY 2004

Butterfly Valves:

Double Flanged, Lug- and Wafer-Type

Downstream Segment

API STANDARD 609 SIXTH EDITION, MAY 2004

SPECIAL NOTES

API publications necessarily address problems of a general nature. With respect to partic- ular circumstances, local, state, and federal laws and regulations should be reviewed.

API is not undertaking to meet the duties of employers, manufacturers, or suppliers to warn and properly train and equip their employees, and others exposed, concerning health and safety risks and precautions, nor undertaking their obligations under local, state, or fed- eral laws.

Information concerning safety and health risks and proper precautions with respect to par- ticular materials and conditions should be obtained from the employer, the manufacturer or supplier of that material, or the material safety data sheet.

Nothing contained in any API publication is to be construed as granting any right, by implication or otherwise, for the manufacture, sale, or use of any method, apparatus, or prod- uct covered by letters patent. Neither should anything contained in the publication be con- strued as insuring anyone against liability for infringement of letters patent.

Generally, API standards are reviewed and revised, reaf?rmed, or withdrawn at least every

?ve years. Sometimes a one-time extension of up to two years will be added to this review cycle. This publication will no longer be in effect ?ve years after its publication date as an operative API standard or, where an extension has been granted, upon republication. Status of the publication can be ascertained from the API Standards department telephone (202) 682-8000. A catalog of API publications, programs and services is published annually and updated biannually by API, and available through Global Engineering Documents, 15 Inv- erness Way East, M/S C303B, Englewood, CO 80112-5776.

This document was produced under API standardization procedures that ensure appropri- ate noti?cation and participation in the developmental process and is designated as an API standard. Questions concerning the interpretation of the content of this standard or com- ments and questions concerning the procedures under which this standard was developed should be directed in writing to the Director of the Standards department, American Petro- leum Institute, 1220 L Street, N.W., Washington, D.C. 20005. Requests for permission to reproduce or translate all or any part of the material published herein should be addressed to the Director, Business Services.

API standards are published to facilitate the broad availability of proven, sound engineer- ing and operating practices. These standards are not intended to obviate the need for apply- ing sound engineering judgment regarding when and where these standards should be utilized. The formulation and publication of API standards is not intended in any way to inhibit anyone from using any other practices.

Any manufacturer marking equipment or materials in conformance with the marking requirements of an API standard is solely responsible for complying with all the applicable requirements of that standard. API does not represent, warrant, or guarantee that such prod- ucts do in fact conform to the applicable API standard.

All rights reserved. No part of this work may be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher. Contact the Publisher,

API Publishing Services, 1220 L Street, N.W., Washington, D.C. 20005.

Copyright ? 2004 American Petroleum Institute

FOREWORD

This standard is a purchase speci?cation for butter?y valves designed for installation between ?anges speci?ed in ASME B16.1, B16.5, B16.24, and B16.42, Classes 125-600; MSS SP-44, Class 150; and ASME B16.47 Series A, Class 150 (was MSS SP-44 except for certain materials) or Series B (was API 605), Class 150 for the NPS sizes de?ned herein.

This standard requires the purchaser to specify certain details and features. Although it is recognized that the purchaser may desire to modify, delete, or amplify sections of this stan- dard, it is strongly recommended that such modi?cations, deletions, and ampli?cations be made by supplementing this standard, rather than by rewriting or incorporating sections thereof into another complete standard.

API standards are published as an aid to procurement of standardized equipment and materials. These standards are not intended to inhibit purchasers or producers from purchas- ing or producing products made to speci?cations other than those of API.

API publications may be used by anyone desiring to do so. Every effort has been made by the Institute to assure the accuracy and reliability of the data contained in them; however, the Institute makes no representation, warranty, or guarantee in connection with this publication and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any federal, state, or municipal regulation with which this publication may con?ict.

Suggested revisions are invited and should be submitted to API, Standards department, 1220 L Street, NW, Washington, DC 20005.

iii

IMPORTANT INFORMATION CONCERNING USE OF ASBESTOS OR ALTERNATIVE MATERIALS

Asbestos is speci?ed or referenced for certain components of the equipment described in some API standards. It has been of extreme usefulness in minimizing ?re hazards associated with petroleum processing. It has also been a universal sealing material, compatible with most re?ning ?uid services.

Certain serious adverse health effects are associated with asbestos, among them the seri- ous and often fatal diseases of lung cancer, asbestosis, and mesothelioma (a cancer of the chest and abdominal linings). The degree of exposure to asbestos varies with the product and the work practices involved.

Consult the most recent edition of the Occupational Safety and Health Administration (OSHA), U.S. Department of Labor, Occupational Safety and Health Standard for Asbestos, Tremolite, Anthophyllite, and Actinolite, 29 Code of Federal Regulations Section 1910.1001; the U.S. Environmental Protection Agency, National Emission Standard for Asbestos, 40 Code of Federal Regulations Sections 61.140 through 61.156; and the U.S. Environmental Protection Agency (EPA) rule on labeling requirements and phased banning of asbestos products (Sections 763.160-179).

There are currently in use and under development a number of substitute materials to replace asbestos in certain applications. Manufacturers and users are encouraged to develop and use effective substitute materials that can meet the speci?cations for, and operating requirements of, the equipment to which they would apply.

SAFETY AND HEALTH INFORMATION WITH RESPECT TO PARTICULAR PRODUCTS OR MATERIALS CAN BE OBTAINED FROM THE EMPLOYER, THE MANUFACTURER OR SUPPLIER OF THAT PRODUCT OR MATERIAL, OR THE MATERIAL SAFETY DATA SHEET.

iv

1. VALVE RATING 1

2. SHELL RATING 1

3. SEAT RATING 2

4. DIFFERENTIAL PRESSURE RATING 2

1. DESIGN 2

   1. GENERAL 2

   2. BODY 2

   3. FACE-TO-FACE DIMENSIONS 2

   4. DISC CLEARANCE 3

   5. SHAFT AND SHAFT SEALS 3

   6. PIPING CONNECTION EXTERNAL BOLT HOLES 3

   7. SEAT RETAINER?CATEGORY B VALVES ONLY 3

   8. OPERATING MECHANISMS 4

   9. ELECTRICAL CONTINUITY 4

   10. PACKING GLAND BOLTING (CATEGORY B VALVES ONLY) 4

2. MATERIALS 4

   1. BODY 4

   2. TRIM 4

   3. SEAT RETAINER-CATEGORY B VALVES ONLY 4

   4. PACKING OR SHAFT SEAL MATERIALS 5

   5. GLAND BOLTING 5

   6. OPERATING MECHANISMS?CATEGORY B VALVES ONLY 5

3. EXAMINATION, INSPECTION, AND TESTING 5

   1. EXAMINATION REQUIREMENTS 5

   2. INSPECTION BY THE PURCHASER 5

   3. PRESSURE TESTS 5

   4. REPAIR OF DEFECTS 5

4. MARKINGS 5

5. PACKAGING AND SHIPPING 6

   1. COATINGS 6

   2. SHAFT PACKING 6

   3. PACKAGING 6

   4. RECOMMENDED SPARE PARTS 6

APPENDIX A DISC-TO-PIPE CLEARANCES 11

v

CONTENTS

Figures

Page

1. External Bolting Options for Lug- and Wafer-Type Valves 8

2. Limitations for Flange Face Interruptions That Fall Within the Gasket

Seating Area (NPS 6 through 48) 9

1. Dimensional Locations for Concentric-Type Construction (Category A) 11

2. Nomenclature and Explanation of Offset-Seat-Type Construction (Category B) . 12 A-3 Relationship of Unlined Steel Pipe Schedules to Valve Category, Size, and

ASME Class 13

Tables

1. Face-to-Face Dimensions for Category A Valves (Lug- and Wafer-Type) 5

2. Face-to-Face Dimensions for Category B Valves 6

3. Minimum Seat Pressure-temperature Ratings for Category B Valves with

PTFE or RPTFE Seats 8

A-1 Nominal Radial Clearances 11

vi

NOTES TO PURCHASER

1. If the purchaser needs a butter?y valve that deviates from this standard, the deviating requirements shall be stated in the purchase order.

2. If no exceptions are to be taken to this standard, the purchase order need only refer to API Standard 609 and specify the items listed in 2.1 (below) and any optional items listed in

2.2 (below). Paragraph 2.3 lists items where agreement between purchaser and manufacturer is required.

1. Required on the Purchase Order

   1. Valve size and class (see 1.1).

   2. Valve Category: A or B (see 1.1).

   3. Type of body style (double ?anged, lug- or wafer-type) (see 1.2 and 4.2.1-4.2.3).

   4. For double ?anged valves specify either: (a) long pattern (see Table 2-B) or short pattern (see Table 2-C). Note Class 300 short pattern has two sets of dimensions. Purchaser must specify which is required.

   5. Type of mating ?ange (slip-on, welding-neck, or other), mating ?ange speci?cation, and ?ange bore or pipe inside diameter, as applicable. The purchaser should verify disc clearances with the valve manufacturer (see 1.2 and 4.4).

   6. Unidirectional or bidirectional ?ow and pressure shutoff requirement (see 4.7.3).

   7. Whether dead-end service is required (see 4.7.4).

   8. Operator type: lever or other (see 4.8).

   9. On-off or throttling service (see 3.4 and 4.8.1).

   10. Materials of construction, including those for trim and those for packing or shaft seals (see Section 5).

   11. Operating conditions including maximum operating temperature, ?ow rate or line velocity, maximum pressure drop, ?uid media, and speci?c gravity (see 4.8.2).

1. Items That May Be Speci?ed

   1. Conformance with API Standard 607 for applications where a ?re tested valve is required (see 4.1.2).

   2. Lockable device (see 4.1.3).

   3. End ?anges attached by welding (see 4.2.3).

   4. Drain or bypass connections (see 4.2.4).

   5. Through drilling or special tapping of lug bolt holes (see 4.6).

   6. Electrical continuity requirement (see 4.9).

   7. Packing or shaft seal materials (see 5.4).

   8. Inspection by the purchaser (see 6.2).

   9. Export packaging (see 8.3).

   10. Special external coating (see 8.1).

   11. Recommended spare parts information (see 8.4).

vii

1. Where Agreement Between the Purchaser and the Manufacturer is Required

   1. Gasket surface interruptions for NPS 4 and smaller (see 4.7.2).

   2. Seat ratings for materials not listed in Table 3 (see 3.3.1).

   3. Use of welded on body extensions or ?anges (See 5.1.2).

3 Refer to API Standard 598 for additional items that may need to be speci?ed, including supplementary examination, the extent of inspection by the purchaser, the inspector?s address, and optional high-pressure closure test.

viii

Butterfly Valves: Double Flanged, Lug- and Wafer-Type

1. Scope

   1. This standard covers design, materials, face-to-face dimensions; pressure-temperature ratings; and examination, inspection, and test requirements for gray iron, ductile iron, bronze, steel, nickel-base alloy, or special alloy butter?y valves that provide tight shutoff in the closed position and are suitable for ?ow regulation. Two categories of butter?y valves are included:

      1. Category A: Manufacturer?s rated cold working pressure (CWP) butter?y valves, usually with a concentric disc and seat con?guration. Sizes covered are NPS 2 to NPS 48 for valves having ASME Class 125 or Class 150 ?ange bolting patterns.

      2. Category B: Pressure-temperature rated butter?y valves that have an offset seat and either an eccentric or a concentric disc con?guration. These valves may have a seat rating less than the body rating. For lug and wafer, Class 150, 300, and 600, sizes covered are NPS 3 to NPS 24 . For double ?anged long pattern, Class 150, 300, and 600, sizes covered are NPS 3 to NPS 36. For double ?anged short pattern, Class 150 and 300, sizes covered are NPS 3 to NPS 48. For double ?anged short pattern, Class 600, sizes covered are NPS 3 to NPS 24.

   2. Valve con?gurations include double ?anged, lug- and wafer-types with facings that permit installation between ASME and MSS ?anges that conform to the standards and speci?cations listed in Section 2.

      
      

2. References

   The most recent edition or revision of the following stan- dards or speci?cations shall, to the extent speci?ed in this standard, form a part of this standard. Text in brackets after a publication title indicates a restriction on the classes to which the publication applies.

   API

   Std 598 Valve Inspection and Testing

   Std 607 Fire Test for Soft-Seated Quarter-Turn Valves

   ASME1

   B1.1 Unified Inch Screw Threads (UN and UNR Thread Form)

   B16.1 Cast Iron Pipe Flanges and Flanged Fit-

   B16.20 Metallic Gaskets for Pipe Flanges-Ring Joint, Spiral Wound, and Jacketed

   B16.24 Cast Copper Alloy Pipe Flanges and Flanged Fittings [Class 150 and 300]

   B16.34 Valves-Flanged, Threaded, and Welding End [Standard Class 150, 300, and 600 only]

   B16.42 Ductile Iron Pipe Flanges and Flanged Fittings, Class 150 and 300

   B16.47 Large Diameter Steel Flanges: NPS 26 Through NPS 60 [Class 150 only]

   B31.3 Process Piping

   B46.1 Surface Texture (Surface Roughness, Wavi- ness, and Lay)

   MSS2

   SP-6 Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings

   SP-25 Standard Marking System for Valves, Fit- tings, Flanges, and Unions

   SP-44 Steel Pipe Line Flanges [Class 150 only]

   SP-45 Bypass and Drain Connections

   SP-91 Guidelines For Manual Operation of Valves

   ISO3

   5752 Face to Face and Center to Face Dimensions

   
   

3. Pressure-Temperature Ratings

   1. VALVE RATING

      Valves shall have a pressure-temperature rating or cold working pressure rating for Category A valves that is the lesser of its shell rating, seat rating, or differential pressure rating.

      
      

   2. SHELL RATING

      1. Category A valve bodies and related pressure bound- ary elements shall have the cold working pressure (CWP) rat- ing assigned by the manufacturer.

      2. Category B valve bodies and related pressure bound- ary elements shall have the pressure-temperature rating as

tings [Class 125 only]

B16.5 Pipe Flanges and Flanged Fittings [Class 150, 300, and 600 only]

1ASME International, 345 East 47th Street, New York, New York 10017.

2Manufacturers Standardization Society of the Valve Fittings Industry, Inc., 127 Park Street, N.E., Vienna, Virginia 22180.

3International Organization for Standardization. ISO publications are avail- able from the American National Standards Institute, 11 West 42nd Street, New York, New York 10036.

1