BS 1212-1-1990 Float operated valves. Specification for piston type float operated valves
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ID： |
2655743231594D1C831C305163942070 |
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文件大小(MB)： |
1.2 |
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页数： |
32 |
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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）：
BS 12 12 : Part 1 : 1990,UDC 621.646.61 8 : 621.646.2 -3 14.1 : 669.35 ’5,0 British Standards Institution. No part of this publication may be photocopied or otherwise reproduced without the prior permission in writing of BSI,British Standard,Float operated valves,Part 1. Specification for piston type float operated valves,(copper alloy body) (excluding floats),Robinets a flotteur,Partie 1. Robinets a flotteur de type piston (corps en alliage de cuivre),(a I’exclusion des flotteurs) - Specifications,Sc h wi m merven t i I e,Teil 1. Kolbenschwimmerventile (mit Gehause aus Kupfer) (ausgenommen Schwimmer),British Standards Institution,Licensed copy:PONTYPRIDD COLLEGE, 13/02/2008, Uncontrolled Copy, . BSI,BS 1212 : Part 1 : 1990,Foreword,This Part of BS 1212 has been prepared under the direction,of the Building Services Standards Committee and specifies,requirements for piston type float operated valves (excluding,floats). It supersedes BS 1212 : Part 1 : 1953, which is,withdrawn.,The new features in this Part of BS 1212 include the,following:,(a) the possible production of certain components from,plastics materials;,(b) an extension of the range of sizes of plastics seats;,(c) a seat numbering system;,(d) a bottom entry inlet connection and its associated,inlet elbow, with adjustable stay;,(e) a recognition of the greater lifting effort of plastics,floats over copper floats of equivalent size;,(f) the supply of size 3/8 and size '12 levers with a,downturn portion fitted with a float adjuster and,thumb screw;,(9) a further method of production for two piece levers,(h) a test for plastics backnut strength, in line with,BS 1212 : Part 3;,(j) a test for plastics locknut strength;,(k) a recognition of current manufacturing practice by,deletion of reference to the use of agate tipped seats.,Due to the fact that valves covered by this Part of BS 1212,do not provide the appropriate backsiphonage protection,required by the Water Byelaws, it is recommended in the,case of nominal size valves that a valve covered by one,of the other Parts of BS 1212 be used for applications,where backsiphonage protection is required. Alternatively,a valve covered by BS 1212 : Part 1 can be used in these,cases if a suitable protective device is connected to the feed,piper to the valve. For nominal size % and above, such a,device should be used whenever backsiphonage,protection is required.,Advice on suitable protective devices is given in the Water,Research Centre publication 'Water Fittings and Materials,Directory'" and in BS 6700.,This Part of BS 1212 has been revised in metric terms,except for certain thread sizes and pipe thread designations,which are retained in imperial sizes to accord with,BS 2779.,Compliance with a British Standard does not of itself,confer immunity from legal obligations.,Licensed copy:PONTYPRIDD COLLEGE, 13/02/2008, Uncontrolled Copy, . BSI,BS 1212 : Part 1 : 1990,Contents,Foreword,Com m ittees res pons i ble,Page,Inside front cover,Back cover,Specification,Section one. General,1 Scope,2 Definition,3 Designation for ordering,4 Marking,Section two. Materials,5 Quality and finish,6 Plastics,7 Castings,8 Hot stampings,9 Mouldings,10 Machining,Section three. Design, construction and dimensions,11 General,12 Screw threads,13 Inlet connection,14 Backnuts,15 Bodies,16 Body coupling nuts,17 Body end caps,18 Pistons and piston washers,19 Seats,20 Levers,21 Locknuts for levers,22 Float adjusters and thumb screws,23 Split cotter pins,Section four. Performance,24 Hydraulic pressure and shut-off,25 Backnut distortion,26 Locknut distortion,27 Mechanical strength of levers,Appendices,A Method of test for shut-off when assembled,with appropriate float,2,2,2,2,3,3,3,3,3,3,5,5,6,6,6,6,6,6,7,7,7,8,8,9,9,9,9,30,B Method of test for distortion of size '/z,plastics backnuts,C Method of test for distortion of plastics,locknuts,D Method of test for mechanical strength,of levers,E Discharge of water through piston type float,operated valves,Tables,1 Materials,2 Body, seat and float combination,3 Side entry inlet shank and inlet for,connection to 12 mm and 15 mm copper tube,4 Type (a) backnuts (integral flange),5 Type (b) backnuts (spigoted),6 Type (c) backnuts (fixed flange),7 Bodies,8 Body coupling nuts,9 Body end cap,10 Pistons and piston washers,11 Seats and joint ring for seats,12 Seat numbers,13 Levers,14 Test loads for levers,15 Computed flow through seat orifices,Figures,1 Section of typical size '/z piston type float,operated valve with detail of inlet and,alternative lever arm,2 Inlet shanks,3 Inlet elbows,4 Backnuts,5 Bodies,6 Body coupling nuts,7 Body endcap,8 Pistons and piston washers,9 Seats……
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