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4300Catalog Seal-LokTMO-RingFaceSealTubeFittings TheSeal-LokBrazeSleeve.Asecondmethodofsleeveat- BrazeSleeve tachmentiswiththebrazesleeve.Thesleeveisbrazedtothe O-ring(Trap-Seal) tubeendasshowninFig.A3.Theflat,smoothsurfaceofthe brazesleevesealsagainsttheO-ringwhenfullyassembled. Parflange Theholdingpowerisprovidedbythebraze. Sleeve TheSeal-LokTrap-SealTM.TheTrap-Seal,withitsconsistently positiveretentioninthegroove,essentiallyeliminatesthepos- sibilityoffullorpartialO-ringpopout.Theseal'strapezoidal shapedcross-sectionleadstoimprovedretentionwithinSeal- Lok'sCORGgrooveandvirtuallyeliminatescostlyleakageand timeconsumingpre-assemblyhandling.Thegroovedesign hasnotchanged,sothestandardO-ringcanbeusedforseal Nut replacementinthefield.Currently,theTrap-Sealisofferedin FittingBody 90-durometerNitrile(NBR). Fig.A3--Seal-LokUnioncutawaywithflanged andbrazedassemblies HowSeal-LokFittingsWork TheSeal-LokfittingbodyfacecontainsahighdurometerO-ring thatisheldcaptiveinaprecisionmachinedgroove.Asthenut istightenedontothefittingbody,theO-ringiscompressedbe- tweenthebodyandflatfaceofthetubeflangeorbrazesleeve toformatight,positiveseal(seeFig.A3). Asthetwofacescomeincontact,furthertighteningofthenut producesasharpriseinassemblytorque.Asolidpullofthe wrenchatthispoint,torecommendedassemblytorque,com- pletestheassembly.Thesharptorquerisegivesa"solidfeel"at assembly,minimizingthepossibilityofovertightening. Becausethesealingsurfacesareflatandperpendiculartothe assemblypull,theyremainvirtuallyfreeofdistortionduring assembly,givingSeal-Lokfittingspracticallyunlimitedremake- Turned ability.TheO-ringshouldbeinspectedateachdisassemblyand Diameter replacedwhennecessary.SeetheO-RingsandSealssection forinformationonreplacementORFSO-rings. TurnedDiameter withGroove AssemblyandInstallation Fig.A4--MetricSeal-LokStraightandShapedConnectorswith PleaserefertoSectionTfortheassemblyandinstallation IdentificationforusewithISO6149-1Port instructionsforSeal-Lokfittings. SmallIdentification GrooveforMetricTube MetricSeal-Lok Thetube/hoseendconnectionformetricSeal-Lokisthesame asstandard(inch)Seal-Lok.Itconsistsofabody,aflangeor brazesleeve,anO-ringandanut.Thedifferenceisattheport endofthefitting.InsteadoftheSAEstraightthreadconnec- tion,itfeaturesasimilarconnectionwithmetricthreadsperISO 6149-2.Additionally,thefittingbody,tubenutandlocknutare manufacturedwithmetrichexesorforgingwrench flats.The metric Seal-Lok fittings meet or exceed all requirements of ISO8434-3. Fig.A5--Metric(Tube)Seal-LokSleeves A6 ParkerHannifinCorporation TubeFittingsDivision Columbus,Ohio http://www.parker.com/tfd
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