Rotary Seal Design Guide - Seals Unlimited

Parker Oil SealsCatalog EPS 5350/USAMaterialsCase Code (B, A, P) — Metal CaseCold rolled carbon steel is the most common andcost-effective metal case material. Cases aretreated to resist corrosion during normal handlingand storage. Stainless steel case materials areavailable at additional cost for use in corrosiveapplications and extreme conditions. A frontchamfer and ParKote polymer coating on the ODof the metal case is standard. ParKote coatingfills small imperfections in the bore. A ground ODis also available.Case Code (C, M, D) — Rubber CoveredCase material can be partially or completelycoated in rubber. Generally, carbon steel casesare used in rubber covered profiles. Rubbercovered OD can ease installation and improvebore sealability.Table 6-4. Case Profiles/MaterialsApplication Description ProfileMost common andeconomical.ParKote coating isstandard.Improved OD sealingin bores with minorimperfections and insoft alloy housings.Inner case providesstructural rigidity forlarge cross-sections.ParKote coating isstandard. Guidesshaft duringinstallation.Protects metal casefrom internalcorrosion.“L” CaseRubber CoveredCaseDouble CaseRubber LinedCaseBCAMSpring MaterialsSprings are available in a wide range ofmaterials. Parker Oil Seal designs are furnishedwith carbon steel springs as standard. Otherspring materials are available at an additional cost.Table 6-5 shows general operating parameters forthe most common spring materials.Table 6-5. Spring Material ParametersWire TypeMaximumServiceTemperature°C °FApplicationCarbon Steel 120 250 General purposeMonel 400 230 450 SaltwaterInconel 750 675 1250 Extreme temperaturePhosphorBronze302/304Stainless Steel316 StainlessSteel95 200 Saltwater260 500 Corrosion resistance315 600 Hi-temp corrosionresistanceHastelloy ® 315 600 Hi-temp66Ease of removal.Positioning Flange.“P” CasePReduced spring back.Ease of installation.Combines sealabilityof rubber OD andmetal retention ofmetal ODHeel CaseD03/28/066-7 Parker Hannifin CorporationEPS DivisionToll Free: (800) 233-3900www.parkerseals.com