BS 7461-1991 Specification for electrically operated automatic gas shut-off valves fitted with throughput adjusters, proof of closure switches
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ID： |
6E900693CB934B819047769E1991AB38 |
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文件大小(MB)： |
0.49 |
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页数： |
10 |
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文件格式： |
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日期： |
2024-6-23 |
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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 7461: 1991,Specification for,Electrically operated,automatic gas shut-off valves,fitted with throughput,adjusters, proof of closure,switches, closed position,indicator switches or gas flow,control,X(H 'OPYI\(； I\ AXY I'OItM WITIIOCT ヽYIHTTEX PEKMISSIOX FliOM BSI STANDARDS,BS 7461: 1991,Committees responsible for this,British Standard,The preparation of this British Standard was entrusted by the Gas Standards,Policy Committee (GSE/-) to Ibchnical Committee GSE/22, upon which the,following bodies were represented:,Association of Control Manufacturers — TACMA (BEAMA Ltd.),British Combustion Equipment Manufacturers, Association,British Gas plc,Chief and Assistant Chief Fire Officers, Association,Department of Trade and Industry (Consumer Safety Unit, CA Division),Health and Safety Executive,Liquefied Petroleum Gas Industry Thchnical Association (UK),Society of British Gas Industries,This British Standard, having,been prepared under the,direction of the Gas Standards,Policy Committee, was published,under the authority of the,Standards Board and comes into,effect on 30 September 1991,. BSI1991,The following BSI references,relate to the work on this,standard:,Committee reference GSE/22,Draft for comment 91/75437 DC,ISBN 0 580 19830 8,Amendments issued since publication,Amd. No. Date Ibxt affected,BS 7461: 1991,Contents,Page,Committees responsible Inside front cover,Foreword 2,Specification,1 Scope 3,2 Definitions 3,3 Valves fitted with throughput adjusters 3,4 Valves fitted with proof of closure switches 3,5 Valves fitted with closed position indicator switches 4,6 Valves incorporating start-gas flow control and valves in which the,flow rate may be varied electrically 4,Appendices,A Tbst for valves fitted with throughput adjusters 6,B Ibst for valves fitted with proof of closure switches 6,C Ibst for vsdves fitted with closed position indicators 6,D Ibsts for valves incorporating start-gas flow control and in which the,flow rate may be varied 6,1,BS 7461: 1991,Foreword,This British Standard has been prepared under the direction of the Gas Standards,Policy Committee for publication alongside BS EN 161, the European Standard,for automatic shut-off valves that replaces BS 5963 : 1982, which is withdrawn.,This standard specifies requirements and methods of test for throughput,adjusters, proof of closure switches, closed position indicator switches or gas flow,control which may be fitted to electrically operated automatic gas shut-off valves,which wei'e previously within the scope of BS 5963 : 1982 and are outside the,scope of BS EN 161. .,The requirements and methods of test for automatic shut-off valves themselves,are now covered by BS EN 161. . r,This standard retains the requirements for such additional features, pending,publication of European Standards for additional features, and will be,withdrawn on the publication of such standards.,Compliance with a British Standard does not of itself confer immunity from,legal obligations.,BS 7461: 1991,Specification,1 Scope,This standard specifies the requirements and test,methods for throughput adjusters, proof of closure,switches, closed position indicator switches,start-gas flow control and electrical variation of,flow rate when fitted to electrically operated,automatic gas shut-off valves which themselves fall,within the scope of BS EN 161t,NOTE. The titles of the publications referred to in this standard,are listed on the inside back cover,2 Definitions,For the purposes of this British Standard, the,definitions given in BS EN 161 apply, together with,the following.,2.1 closed position indicator switch,A switch fitted to a class A, B or C automatic,shut-off valve which indicates when the valve is in,the noirunally closed position.,2,2 proof of closure switch,A switch fitted to a class A, B or C automatic,shut-off valve with mechanical overtravel which,proves the valve to be in the closed position.,2,3 throughput adjuster,A device which restricts the throughput of the,valve and is set before or duiing commissioning.,2.4 start-gas flow rate,The restricted gas flow rate admitted either to a,separate pilot burner or to the main burner during,the start-gas flame establishment period.,2.5 hazardous condition,An abnormal condition involving risk to persons or,property.,3 Wives fitted with throughput,adjusters,3.1 General,3.1.1 Throughput adjusters shall be identified and,shall be marked to indicate the direction of,adjustment.,3,1.2 For adjusters operating over a single turn,means shall be provided for indicating the actual,setting and the minimum and maximum positions,3?1.3 For adjusters operating with a multi-tum,screw, t……
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