Rotary Seal Design Guide - Seals Unlimited

FlexiCase Product OfferingCatalog EPS 5350/USAThe key application considerationsthat help in the selection of the rightFlexiCase profile are operatingtemperature, media abrasiveness,pressure, external contamination,friction requirements, shaft diameterand Total Indicator Runout (TIR). Alsosee Table 10-4 for more information ontemperatures, pressures, speeds andfriction.Total Indicator Runout (TIR) is howfar the shaft is misaligned with the boreduring rotation. This is fullycharacterized in the generalengineering section on Page 2-25. FourFlexiCase profiles are able to handlecontinuous service with runoutconditions up to 0.010" (0.25 mm) ifspeeds are slower than 200 RPM: theCGN, CGE, CJN and CJE. Keep in mindthat the faster a shaft spins, the less TIRthe seal can withstand.These decision trees are to be usedas an engineering guide only. Oftenseveral other parameters must beconsidered to optimize seal design.Contact Parker’s PTFE EngineeringTeam for confirmation of your choice orfurther recommendations. Parker alsorecommends that any seal be tested inthe application conditions beforereleasing for production.Decision Tree< 35(2.4 )OperatingPressurein psi (bar)500 to750(34.5 to51.7)Low speed &high runout?Low speed &high runout?Abrasive Media?35 to 75 (2.4 to 4.8)75 to 500NoYes(4.8 to 34.5)NoYesNeed to excludecontaminants?Need to excludecontaminants?YesNoNeed to excludecontaminants?YesNoNeed to Noexcludecontaminants?Need to excludecontaminants?YesNoYesYesNoYesNoCMECMNCEECENCFECFNCGECGNCDECDNCJENeed to excludecontaminants?Need to excludecontaminants?YesNoYesCJNCHE1010NoCHN03/28/0610-7 Parker Hannifin CorporationEPS DivisionToll Free: (800) 233-3900www.parkerseals.com