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Catalog4300 EOandEO-2MetricBiteTypeFittings thehardness,strength,andtoughnessnecessarytosatisfythe EOProgressiveRingFittings demandingserviceconditionsthatexistinindustrytoday.The originalprogressivering,knownasDPR,isnowbeingreplaced --Introduction withthenewgeneration,calledPSR.PSRisstrongerandfea- TheflarelessbitetypefittingwaspioneeredbyErmetoinGermany turesa"positivestop"toeliminateover-tightening. intheearly1930's.WhenParkerHannifinacquiredErmeto,it TheEONut.EOfittingnutsareeithercoldformed,hotformed introducedtheEOfittingstotheUS.Today,theEOfittingsare ormachinedfromcolddrawnmaterial.Thecoldformingand themostwidelyusedbitetypefittingsintheworld. colddrawingoperationsprovideamoretightlypackedgrain TheEOprogressiveringfittingisaflarelessmetricfitting(for structure,thusimprovingthematerial'sstrength.Inaddition, metrictube)thatconsistsofabody,aprogressivering(ferrule) cold forming significantly improves the fatigue properties or andanut.Onassembly,twocuttingedgesoftheprogressivering endurancelimitsofthenuts. "bite"intotheoutersurfaceofthetubeensuringthenecessary holdingpowerandsealforhighoperatingpressures. StandardMaterialSpecifications Steelfittings: EOtubefittings �MaterialsaccordingtoDIN3859-1 Stainlesssteelfittings: EOtubefittings �X6CrNIMoTi17122inaccordancewith DIN17440/EN10088,materialno. 1.4571. Brassfittings: EOtubefittings �CUZN35Ni2inaccordancewithDIN 17660,materialno.2.0540. Fig.H1--EOfittingcomponents:Body,progressivering Elastomerseals: NBR(BUNA-N),FKM(Fluorocarbon) andnut SurfaceFinish-Steelfittings: Thefittingsandcomponentslistedinthiscatalogareintended Standard solelyfortheassemblyofconnectionsforfluidapplications. LLSeries Body,Nuts,andRings �Zincclearchromate, Chromium6Free ThreeseriesofEOtubefittings(LL,LandS)andaccessories are manufactured in accordance with DIN 2353 (summary) L+SSeries BodyandNuts �Zincclearchromate, whichtodayisrepresentedbyinternationalstandard8434-1 Chromium6Free onthebasisofdecadesofexperience.* ProgressiveRings(PSR) �Zincclearchromate, Chromium6Free ToensurefunctionalsafetyofEOtubefittings,onlyEOparts shouldbeusedintheirassembly.Routingoftubesshouldbe Shortcodesforsurfaceprotectionprocedureinaccordance carriedoutinaccordancewithParker/EOrecommendedprac- withDIN267part9orDIN50942. tices.Assemblyinstructionsareavailable. HowEOFittingsWork:Function DesignandConstruction ofProgressiveRingFittings ThethreecomponentsofEOfittingsaredesignedandmanufac- turedtoproduceastrong,reliable,leak-freejointuponproper TheEOprogressiveringfittingproducesalowtohighpressure, assembly. leakfreeconnectionoftubesandcomponentsinfluidsystems. ThebasicfunctionoftheEOprogressiveringisthecontrolled TheEOBody.EOfittingbodiesareavailableinoverthirtycon- progressivebiteoftheringintothetubeduetoauniqueinternal figurations.Theshapedproducts(i.e.,elbows,tees,crosses)are geometry. hotforged,thenmachinedtothestringentEOfittingspecifica- Thefrontcuttingedgehasalreadystartedcuttingintothetube tions.TheforgingprocessusedbyParkerfurtherimprovesthe beforethesecondcuttingedgestarts.Assoonasbothcutting strengthandmetallurgicalpropertiesofthefittingmaterial. edgeshavecutthetubetothedesigneddepthfurtheradvance islimitedbythestopedge. Straightproductsaremadefromcolddrawnbarstock.Thecold drawingoperationensuresconsistentlytightdimensionaltoler- Owingtothedesignofbothcuttingedgesandstopedgeall ances,aswellassignificantlyimprovedstrength. forces arising are equally distributed.This distribution along withthespeciallydesignedinteriorcollaroftheringguarantees TheEOProgressiveRing(CuttingRing).EOprogressive increasedsafety,particularlywithregardtovibrationandflexure ringsareprecisionmachinedwithalldimensionsandsurfaces, stresses.Thedesignandfunctionoftheprogressivecuttingring particularlythecriticalbiteedges,monitoredonanongoing ensurethatservicevibrationloadingisnotpresentintheareas basis.Theringsarethenheattreatedinamannerthatprovides ofthetubingwherethebiteismade. *TheselectionofLL,LorSdesignshouldbemadebytheuseronthebasisofintendedsystempressure.Thepertinentmaximumrecommended workingpressuresareshownthroughoutthiscataloginindividualdatachartsofthevariousfittingconfigurations. F6 ParkerHannifinCorporation TubeFittingsDivision Columbus,Ohio http://www.parker.com/tfd
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