BS 7438-1991 Steel and copper alloy wafer check valves, single disk, spring-loaded type
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ID： |
6FDCE40BE5F44AC8B94E0BF90E193D2F |
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文件大小(MB)： |
0.17 |
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页数： |
14 |
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文件格式： |
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日期： |
2010-10-4 |
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购买： |
文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
BRITISH STANDARD BS 7438:1991,Specification for,Steel and copper alloy,wafer check valves,single disk,spring-loaded type,BS 7438:1991,This British Standard, having,been prepared under the,direction of the Piping Systems,Components Standards Policy,Committee, was published,under the authority of the,Standards Board and comes,into effect on,31 May 1991,. BSI 08-1999,The following BSI references,relate to the work on this,standard:,Committee reference PSE/7,Draft for comment 90/75853 DC,ISBN 0 580 19614 3,Committees responsible for this,British Standard,The preparation of this British Standard was entrusted by the Piping Systems,Components Standards Policy Committee (PSE/-) to Technical Committee,PSE/7, upon which the following bodies were represented:,Amalgamated Engineering Union,Association of Bronze and Brass Founders,Association of Building Component Manufacturers,British Chemical Engineering Contractors’ Association,British Foundry Association,British Gas plc,British Maritime Technology,British Plumbing Fittings Manufacturers’ Association,British Valve and Actuator Manufacturers’ Association,Chartered Institution of Building Services Engineers,Copper Development Association,Department of the Environment (Property Services Agency),Electricity Supply Industry in United Kingdom,Energy Industries Council,Engineering Equipment and Materials Users’ Association,GAMBICA (BEAMA Ltd.),Health and Safety Executive,Institute of British Foundrymen,Institution of Chemical Engineers,Institution of Gas Engineers,Institution of Mechanical Engineers,Institution of Water and Environmental Management,Liquefied Petroleum Gas Industry Technical Association (UK),Pipeline Industries Guild,Society of British Gas Industries,Society of British Water Industries,Water Companies’ Association,Water Services’ Association of England and Wales,West Midlands CBI,Amendments issued since publication,Amd. No. Date Comments,BS 7438:1991,. BSI 08-1999 i,Contents,Page,Committees responsible Inside front cover,Foreword ii,Section 1. General,1 Scope 1,2 Definitions 1,3 Type 1,4 Nominal sizes 1,5 Nominal and Class pressure designations 1,6 Pressure/temperature ratings 1,7 Dimensions and tolerances 2,Section 2. Design and operation,8 Design 4,9 Operation 4,Section 3. Materials,10 Optional requirements 5,11 Body material 5,12 Disk, spring, spring retainer materials 5,13 Identification plates 5,Section 4. Testing,14 Production pressure testing 6,15 Test certificate 6,Section 5. Marking and packaging,16 Body markings 7,17 Packaging 7,Appendix A Information to be supplied by the purchaser 8,Figure 1 — Typical wafer check valve for use with PN flanges 2,Figure 2 — Typical wafer check valve for use with Class,designated flanges 3,Table 1 — Dimensions and tolerances of wafer check valves for,use with PN flanges (type A) 2,Table 2 — Dimensions and tolerances of wafer check valves for,use with Class designated flanges (type B) 3,Publication(s) referred to Inside back cover,BS 7438:1991,ii . BSI 08-1999,Foreword,This British Standard has been prepared under the direction of the Piping,Systems Components Standards Policy Committee and at the time of publication,of this British Standard no corresponding international standard exists.,Face-to-face dimensions comply with DIN 3202 and tolerances comply with,BS 5155. Body outside diameters for wafer check valves for use with Class,designated flanges are consistent with the dimensions of centring ring outside,diameters of Table 1 of BS 3381:1989 and those for use with PN flanges are,consistent with the dimensions of centring ring outside diameters of Table 1 of,BS 4865-2:1989.,Product certification. Users of this British Standard are advised to consider,the desirability of third party certification of product conformity with this,British Standard based on testing and continuing surveillance, which may be,coupled with assessment of a supplier’s quality systems against the appropriate,Part of BS 5750.,Enquiries as to the availability of third party certification schemes will be,forwarded by BSI to the Association of Certification Bodies. If a third party,certification scheme does not already exist, users should consider approaching an,appropriate body from the list of Association members.,A British Standard does not purport to include all the necessary provisions of a,contract. Users of British Standards are responsible for their correct application.,Compliance with a British Standard does not of itself confer immunity,from legal obligations.,Summary of pages,This document comprises a front cover, an inside front cover, pages i and ii,pages 1 to 8, an inside back cover and a back cove……
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