CGA-E-16-2008.pdf
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1、 CGA E-162008 COMPRESSED GAS CHECK VALVES UP TO 3000 PSIG FIRST EDITION COMPRESSED GAS ASSOCIATION, INC. 4221 Walney Road, 5th Floor Chantilly, VA 20151 Phone: 703-788-2700 E-mail: PAGE ii COMPRESSED GAS ASSOCIATION, INC. CGA E-162008 PLEASE NOTE: The information contained in this document was obta
2、ined from sources believed to be reliable and is based on technical information and experience currently available from members of the Compressed Gas Association, Inc. and others. However, the Association or its members, jointly or severally, make no guarantee of the results and assume no liability
3、or responsibility in connection with the information or suggestions herein contained. Moreover, it should not be assumed that every acceptable commodity grade, test or safety procedure or method, precaution, equipment or device is contained within, or that abnormal or unusual circumstances may not w
4、arrant or suggest further requirements or additional procedure. This document is subject to periodic review, and users are cautioned to obtain the latest edition. The Associa- tion invites comments and suggestions for consideration. In connection with such review, any such comments or suggestions wi
5、ll be fully reviewed by the Association after giving the party, upon request, a reasonable op- portunity to be heard. Proposed changes may be submitted via the Internet at our web site, . This document should not be confused with Federal, state, provincial, or municipal specifications or regulations
6、; insurance requirements; or national safety codes. While the Association recommends reference to or use of this document by government agencies and others, this document is purely voluntary and not binding. A listing of all publications, audiovisual programs, safety and technical bulletins, and saf
7、ety posters is available via the Internet at our website at . For more information contact CGA at Phone: 703-788-2700, ext. 799. E-mail: . Work Item 00-88 Industrial Gases Apparatus Committee FIRST EDITION: 2008 2008 The Compressed Gas Association, Inc. All rights reserved. All materials contained i
8、n this work are protected by United States and international copyright laws. No part of this work may be reproduced or transmitted in any form or by any means, electronic or mechanical including photocopying, recording, or any informa- tion storage and retrieval system without permission in writing
9、from The Compressed Gas Association, Inc. All requests for permission to reproduce material from this work should be directed to The Compressed Gas Association, Inc., 4221 Walney Road, Suite 500, Chantilly VA 20151. You may not alter or remove any trademark, copyright or other notice from this work.
10、 -,-,- CGA E-162008 COMPRESSED GAS ASSOCIATION, INC. PAGE III Contents Page 1 Introduction.1 2 Scope .1 3 Definitions.1 4 Design requirements2 4.1 Durability2 4.2 Operating temperature 2 4.3 Connections.3 4.4 Application and usage.3 5 Materials.3 5.1 Material compatibility.3 5.2 Materials in oxidizi
11、ng service.3 5.3 Cleanliness3 6 Marking.3 6.1 General3 6.2 Direction of flow.3 6.3 Additional markings.4 7 Performance data.4 8 Qualification testing4 8.1 General4 8.2 Proof test.4 8.3 Burst test (hydrostatic).4 8.4 Cycle test.4 8.5 Vibration test5 9 Production testing.5 9.1 Cleanliness5 9.2 Leak te
12、sting.5 9.3 Other considerations .5 10 Maintenance.5 10.1 General recommendations5 10.2 Frequency of testing5 10.3 User responsibility.5 11 References.5 Figure Figure 1Typical check valves 2 -,-,- This page is intentionally blank. CGA E-162008 COMPRESSED GAS ASSOCIATION, INC. PAGE 1 1 Introduction M
13、any years of field use and experience have shown that various types of equipment using Compressed Gas Association (CGA) standard cylinder valve, pipeline, and manifold connections are reliably safe when operated in accordance with manufacturers instructions. Under certain circumstances, the users fa
14、ilure to follow these instructions can cause the backflow of unwanted gas into a pipeline, cylinder, or other equipment. The purpose of a check valve is to reduce the possibility of a reverse flow of gas or simply to keep the atmos- phere, moisture, dirt, etc. from backing up into a system when chan
15、ging connections. Check valves are not intended to act as fire stops (flame arrestors) or as replacements for shutoff valves. Check valves that meet the requirements of this standard must not be misconstrued as a substitution or re- placement for the backflow check provisions in NFPA 51, Standard fo
16、r the Design and Installation of Oxygen- Fuel Gas Systems for Welding, Cutting and Allied Processes; CGA E-2, Hose Line Check Valve Standards for Welding and Cutting; or NFPA 99, Standard for Health Care Facilities, unless properly specified for that particu- lar use 1, 2, 3.1 Safe use of gas piping
17、 equipment including check valves can only be assured by the observance of proper op- erating procedures and safe practices recommended by the equipment manufacturers, industry associations, and regulatory bodies. 2 Scope This standard applies to check valves used in general industrial and medical c
18、ompressed gas service designed for service pressures up to 3000 psig (20 680 kPa) and used in conjunction with cylinder valve or manifold con- nections specified by various standards of CGA.2 These connections may be incorporated as part of equipment such as regulator inlet connections, manifold con
19、nections, or other high pressure hose line (pigtail) inlet and outlet connections. See CGA E-3, Pipeline Regulator Inlet Connection Standards; CGA E-9, Standard for Flexible PTFE-Lined Pigtails for Compressed Gas Service; CGA E-11, Standard for Stationary Compressed Gas Cylinder Discharging Manifold
20、s for Working Pressure up to 3000 psig; CGA V-1, Standard for Compressed Gas Cylinder Outlet and Inlet Connections; and CGA V-10, High Pressure Gas Trailer Connections 5, 6, 7, 8, 9. This standard does not apply to check valves used as an integral part of a regulator, residual pressure cylinder valv
21、e, gas pump, or otherwise internal component of other equipment. This standard does not apply to cryo- genic or liquefied gas check valves. Flammable, toxic, high purity, or specialty gas applications can require additional specialized design require- ments. 3 Definitions For the purpose of this pub
22、lication, the following definitions apply. 3.1 Check valve Device designed to allow gas to flow in one direction only. NOTEA check valve typically consists of a housing (or housed within an inlet/outlet nipple or hose line (pigtail) end fitting) and valve/seat mechanism that is biased by pressure an
23、d/or a spring in the closed direction (see Figure 1). 1 References are shown by bracketed numbers and are listed in order of appearance in the reference section. 2 kPa shall indicate gauge pressure unless otherwise noted as (kPa, abs) for absolute pressure or (kPa, differential) for differen- tial p
24、ressure. All kPa values are rounded off per CGA P-11, Metric Practice Guide for the Compressed Gas Industry 4. -,-,- PAGE 2 COMPRESSED GAS ASSOCIATION, INC. CGA E-162008 Figure 1Typical check valves 3.2 Flow coefficient (Cv) Numeric constant used to characterize flow capacity and comparable to an eq
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