STANDARDS标准BSI1990NOCOPYINGINANYFORMWITHOUTWRITTENPERMISSIONFROMBSIBSI1990。未经BSI书面认可，不得以任何形式进行复制。BRITISHSTANDARD英国标准BS1212:Part3:1990BS1212:第3部分：1990FloatoperatedvalvesPart3.Specificationfordiaphragmtypefloatoperatedvalves(plasticsbodied)forcoldwaterservicesonly(excludingfloats)浮子阀第3部分：仅供冷水用隔膜型塑料体浮子阀(不包括浮子)规范Contents目录Page页码Committeesresponsible委员会责任insidefrontcover封二Foreword前言3Specification规范Section1.General第一节概述41Scope适用范围42Definitions定义43Designationforordering订单名称44Marking标记5Section2.Materials第二节材料35Effectofnon-metallicmaterialsonwaterquality非金属材料对水质的影响36Plastics塑料37Metals金属3Section3.Design,constructionanddimensions第三节设计、结构和规格48Inletconnection入口连接件49Seats阀座410Backnuts支承螺母511Floatarmorfloatarmassembly浮子臂或浮子臂总成612Dischargearrangement排泄装置8Section4.Performance第四节性能913Distortionanddeflection变形和挠曲914Hydraulicpressure液压915Backflow回流916Flow流量917Endurance耐疲劳性10Appendices附录AppendixADistortiontestforbacknutsandinletshank附录A.支承螺母和进口胫部的变形试验11AppendixBDiaphragmtypefloatoperatedvalveassemblytest附录B隔膜型浮子阀门总成试验11AppendixCFloatattachmentthreaddistortiontest附录C浮子连接物螺纹变形试验14AppendixDShut-offpressuretest附录D截流压力试验15AppendixEMethodoftestforeffectofdynamicpressureondischargearrangement附录E排泄装置的动态压力效果试验方法15AppendixFBackflowpreventiontest附录F回流防止试验16AppendixGFlowtest附录G流量试验18AppendixHEndurancetest附录H持久试验201Page页码Figures图Figure1.IllustrationofeffectivewarningwaterlevelinrelationtoothercommonlydefinedlevelsinaBritishStandardflushingcistern图1与英国标准冲洗水箱里的其他通常规定水位相关的有效警戒水位的图解Figure2.Bottomentryvalveinletarrangement图2下端插入阀入口装置2Figure3.Sideinletshankconnectors图3侧面进口胫部连接器5Figure4.Hexagonalbacknuts图4六边形支承螺母7Figure5.Floatconnectingdimensions图5浮子连接规格8Figure6.Inletshankandbacknutstest图6进口胫部和支承螺母试验12Figure7.Valveassemblydeflectiontest图7阀总成挠曲试验13Figure8.Floatattachmentthreaddistortiontestpiece图8浮子连接物螺纹变形试件16Figure9.Typicalarrangementofapparatusforbackflowpreventiontest图9回流防止试验仪器的典型装置18Figure10.Flowtestapparatus图10流量试验仪器202Foreword前言ThisPartofBS1212hasbeenpreparedunderthedirectionoftheBuildingServicesStandardsCommittee.ItisarevisionofBS1212:Part3:1979,whichiswithdrawn.本部分BS1212在建筑设备标准委员会的指导下制作完成。它是1979年版BS1212第3部分的修订版本，而1979年版BS1212第3部分已撤销。ThisPartofBS1212specifiestheoperationalrequirementsofdiaphragmtypefloatoperatedvalves(plasticsbodied)(excludingfloats)forusewithcoldwaterservicesonly.Itisaperformance-basedspecificationandthedimensionalrequirementsaresolelythoseessentialtoensurefittingandinterchangeabilityofcompletevalves.本部分BS1212详细说明仅供冷水用隔膜型塑料体浮子阀(不包括浮子)的操作要求。它是以性能为基础的规范，且规格要求仅为确保完整阀的装配和可交换性的要素。ThenewfeaturesincorporatedinthisrevisionofBS1212:Part3includethefollowing:BS1212第三部分的修订版本里包含的新特点包括以下方面：(a)bottomentryrequirements;下端插入要求；(b)highpressureflowrequirements;高压流量要求；(c)rationalizationtoonesizeoffloat;一种尺寸浮子的合理化；(d)floatattachmentrequirements;浮子连接物要求；(e)dynamicpressure...
