MIL-PRF-123/5B, PERFORMANCE SPECIFICATION SHEET, CAPACITORS, FIXED, CERAMIC DIELECTRIC, (TEMPERATURE STABLE AND GENERAL PURPOSE), HIGH RELIABILITY, LEADED, STYLE CKS12 (18 JUN 2001)., This specification is approved for use by all Departments and Agencies of the Department of Defense.

【英文标准名称】:Industrial-processcontrolvalves-Part2-1:Flowcapacity-Sizingequationsforfluidflowunderinstalledconditions
【原文标准名称】:工业过程控制阀第2-1部分:流通能力安装条件下流体流量的校准公式
【标准号】:IEC60534-2-1-1998
【标准状态】:作废
【国别】:国际
【发布日期】:1998-09
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/SC65B
【标准类型】:()
【标准水平】:()
【中文主题词】:定义;流体技术;尺寸;流量率;流量;控制阀;方程;电气工程;过程测量和控制技术;过程控制;流量控制;管道;数学计算;容量;流体;阀门;流动;方向控制阀;公式;尺寸选定
【英文主题词】:Capacity;Controlvalves;Controlvalvesandfittings;Definitions;Dimensioning;Dimensions;Direction-controlvalves;Electricalengineering;Equations;Flow;Flowcapacity;Flowcontrol;Flowmeasurements;Flowrates;Fluidtechnology;Fluids;Formulae;Industrialfittings;Liquids;Mathematicalcalculations;Pipelines;Processautomation;Processcontrol;Processmeasuringandcontroltechnology;Ratingequation;Valves
【摘要】:ThispartofIEC60534includesequationsforpredictingtheflowofcompressibleandincompressiblefluidsthroughcontrolvalves.TheequationsforincompressibleflowarebasedonstandardhydrodynamicequationsforNewtonianincompressiblefluids.Theyarenotintendedforusewhennon-Newtonianfluids,fluidmixtures,slurries,orliquid-solidconveyancesystemsareencountered.Atverylowratiosofpressuredifferentialtoabsoluteinletpressure(△p/p1),compressiblefluidsbehavesimilarlytoincompressiblefluids.Undersuchconditions,thesizingequationsforcompressibleflowcanbetracedtothestandardhydrodynamicequationsforNewtonianincompressiblefluids.However,increasingvaluesof△p/p1resultincompressibilityeffectswhichrequirethatthebasicequationsbemodifiedbyappropriatecorrectionfactors.Theequationsforcompressiblefluidsareforusewithgasorvapourandarenotintendedforusewithmultiphasestreamssuchasgas-liquid,vapour-liquidorgas-solidmixtures.Forcompressiblefluidapplications,thispartofIEC60534isvalidforvalveswithxT≤0,84(seetable2).ForvalveswithxT>0,84(e.g.somemultistagevalves),greaterinaccuracyofflowpredictioncanbeexpected.ReasonableaccuracycanonlybemaintainedforcontrolvalvesifKv/d<0,04(Cv/d<0,047).
【中国标准分类号】:N16
【国际标准分类号】:23_060_40
【页数】:47P;A4
【正文语种】:英语