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� 4300Catalog Ferulok FlarelessBiteTypeFittings Seal HowFerulokFittingsWork with body Asmentionedintheintroduction,theferruleintheFerulokfit- tingformspressuretightsealswiththetubeandthefittingbody. Thesesealsaretheresultofseveralkeycharacteristicsgraphi- callyshowninFig.D2.Belowaredetailedexplanationsofeach ofthesekeyfeatures. Seal B A. Whenproperlyassembled,thewedgingactionoftheFerulok A C with designwillcausetheendofthetubetopressfirmlyagainstthe tube Compression seatinthebody.Thisactionwillcausethetubetodevelopa grip smallindentationcircumferentiallyonthebottomofthetube. Thisindentationservesasagoodpostassemblyinspection criterion. B. Astheferrulemovesforward,itcontactsthetaperedseat ofthebody,whichcausestheferruletocaminwardinto thetube.Theleadingedgeofthehardenedferrulemakes aclean360�cutintotheoutsidediameterofthetube.This cutisoftentermeda"bite"andthus"bitetypefitting".Asthe ferrulemakesitsbite,asmallridgeofmaterialisplowedup infrontoftheferrule.Thisintimatecontactofthetuberidge withtheferrule'sfrontfaceandbiteedgegivesthefittingits abilitytoretainhighpressurewithoutleakingorblowingoff. Asecondsealpointisalsocreatedbetweenthenowbowed ferruleandthefittingbodyseat. C. Astheferrulebitesintothetube,themidsectionwillbow andtheinsidediameterofthebackarea firmlygripsthe Fig.D2�AssembledFerulokFittingwithTube tube.Thisactionkeepsthestresses,causedbyflexuraland vibrationloading,frombeingconcentratedinthebitearea. The"compressiongrip"atthebackendisakeyfactorforlong lifeinrigorousapplications. Seal Whenproperlyassembledtotherecommendedtube,Ferulok fittingswillconsistentlysealuntiltheappliedpressureisgreat enoughtocausetubeburst. Although not as common, Ferulok fittings can be purchased withoutnutsandsleevesforuseasahoseadapter(Fig.D3). Sealingoccursbetweenthe24�coneofthefittingbodyandthe hoseswivelasshown. AssemblyandInstallation Fig.D3�FerulokFittingwithHoseAssembly PleaserefertoSectionTfortheassemblyandinstallationin- structionsforFerulok�fittings. TubeRecommendation Steel Size StainlessSteel Maximumtubewallthicknessisbasedonthepressureholding capabilityofFerulokfittings.Tubesabovetherecommendedrange Minimum Maximum canbeused.However,thepressureholdingcapabilityoftheas- O.D. Dash Wall Wall Inches Number Thickness Thickness semblywillbelimitedtothefittingcapacity.TheproperFerulok assemblyproceduresasoutlinedonpagesT23-T26ofthiscatalog 1/8 -2 0.010 0.035 arecriticaltotheperformanceofthefitting.SteelFerulokworks 3/16 -3 0.020 0.049 bestwithseamlessorweldedanddrawnfullyannealedtube,SAE 1/4 -4 0.028 0.065 J356,SAEJ524,SAEJ525(max.hardness,RB72)orequivalent 5/16 -5 0.028 0.065 specificationsteeltube.ForstainlesssteelFerulokfittings,types 3/8 -6 0.035 0.095 304and316ofASTMA269,ASTMA213(max.hardness,RB90) 1/2 -8 0.049 0.120 orequivalentstainlesssteeltubeisrecommended. 5/8 -10 0.058 0.120 3/4 -12 0.065 0.120 Ferulokfittingsarealsosuitableforusewithsoftmetaltubeand 7/8 -14 0.072 0.120 varioustypesofplastictubessuchasnylon,polyethylene,etc. 1 -16 0.083 0.148 Whenusedwithplastictube,itisstronglyrecommendedthata 11/4 -20 0.095 0.188 tubeinsert,suchasT23UI,beusedtopreventtubepulloutdue 11/2 -24 0.095 0.220 totensileloading. 2 -32 0.095 0.220 TableD2--RecommendedTubeWallThickness ConsulttheParkerHannifinTubeFittingsDivisionforothercombi- nationsoftubeandtubefittingmaterialsnotshown. Dimensionsandpressuresforreferenceonly,subjecttochange. D5 ParkerHannifinCorporation TubeFittingsDivision Columbus,Ohio http://www.parker.com/tfd
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