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Catalog4300 EOandEO-2MetricBiteTypeFittings Thesealingandretainingringsarecombinedasapairand HowEO-2FittingsWork areinsertedintotheinternalthreadofthenutinsuchaman- nerthattheycannotfallout,sothatthesethreepartsformone Theretainingringbitesintothetubeinaccordancetotheproven functionalelement. biteringprinciple.Theelastomericsealreducesthedanger ofover-orunderassemblybyaspecialEO-2designfeature: Individualcomponentssuchassealorretainingringcannotbe Beforeassemblythereisagapinbetweentheflatsurfaces forgotten,confusedorassembledinthewrongorientation.Time oftheretainingringandthemetallicsupportringoftheseal. andcostaresavedbyeliminatingsearchingandarrangingthe Assoonastheretainingringhasreachedtheproperincision componentstomakeupindividualjoints. depth,thegapcloses,resultinginasharpincreaseofassembly torque.Thisresultsinuniformandreliablefittingassemblies. FunctionalNutsarecompletelyinterchangeablewiththefull Theassemblyresultcaneasilybeinspectedbyjustchecking rangeofEOtubefittingends. ifthegapisclosed. Afterassemblyanddisassembly,thesealingringcanbereplaced Theseparationofsealingandholdingfunctionstotwoseparate individuallywithoutcuttingoffthetubeend. elementsfinallyallowsamoreeffectivesolutionoftheover-and undertightening problems typically associated with bite type fittings. TubeRecommendations Forsteelfittings: AssemblyandInstallation SeamlesscolddrawnsteeltubesmadefrommaterialSt.35.4 PleaserefertoSectionTfortheassemblyandinstallationin- orfromconditionedbasematerialSt.37.4inaccordancewith structionsforEOandEO-2MetricBitetypefittings. DIN1630,stateofdeliveryNBK(normalannealed)withtube outerandinnerdiametertolerancesinaccordancewithDIN 2391/ISO3304.Max.hardness:HRB75. IntegratedAssemblyTool Forstainlesssteelfittings: Themetallicsupportringofthesealismadeofaspecially Materialno.1.4571and1.4541 designedmaterialandheat-treatmenttoactasanassembly tool.Thismakessurethattheretainingringsecurelycutsinto Seamlessdrawntubesmadefromaustenitic,stainlesssteel thetubesurfacewithoutdamagingthesensitiveinnerconeof materialsno.1.4571and1.4541,inaccordancewithDIN/EN/ thefittingbody. ISO1127.Max.hardness:HRB90. ThisuniquefeatureofEO-2fittingsevenallowsdirectassembly These tubes are particularly recommended for tube fittings, oftubewithoutanyadditionalpre-assemblyprocess.AnEOMAT sincethetubeouterdiameterandwallthickness,tolerances machine(orotherhydraulictool)isstronglyrecommendedto correspond to those of steel tubes in accordance with DIN alloweasyassemblyoflargedimensiontubeanddrasticallysave 2391/ISO3304. totalassemblytime,effortandcosts.Theintegratedassembly toolofEO-2fittingsevenhelpstosavefurthercostsandtrouble Tubewallthicknesses: whenusinganEOMAT-typepresettingmachine:Asthepresetting coneisonlyincontactwiththeelastomericsealinglip,itcannot Inordertodeterminethenecesarytubewallthicknessesfor bewornoutordamagedevenafterthousandsofassemblies. applications,refertothecalculatedpressuresprovidedinthe Thisnotonlysavesreplacementcostsbutalsoavoidsleakage tablesforEOmetrictubing.ThecalculatedpressuresDIN2413-I problemscausedbywornpresettingtools. areforstaticandDIN2413-IIIfordynamicloads. Themaximumwallthicknessisbasedonthepressureholding TheFunctionalNut capacityofthefitting.Insomecases,thewallthicknessofthe tubemightbetoothinforreliableserviceandaninsertmustbe usedtopreventexcessivetubecollapse.Seeassemblysection forrecommendedtubewallthicknesses. Plastictube: EO-2fittingsaresuitableforusewithvarioustypesofplastic tubessuchasnylon,polyethylene,etc.Whenusedwithplastic tube,aninsert(seepageF15)mustbeusedtopreventtube pulloutduetotensileloading. Fig.F5--TheuniqueFunctionalNutallowseasyhandlingand quickassembly. TheuniqueFunctionalNutsimplifieshandlingoffittingcompo- nentsandhelpstominimizestorageandprocurementcosts. F10 ParkerHannifinCorporation TubeFittingsDivision Columbus,Ohio http://www.parker.com/tfd
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