RADIAL SHAFT SEALS
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DICHTOMATIK RADIAL SHAFT SEALS /^iFREUDENBERC INNOVATING TOGETHER

Industry-specific and customized service concepts 6 Product portfolio of the Dichtomatik brand 7 CONSTRUCTION RADIAL SHAFT SEALS OVERVIEW RADIAL SHAFT SEALS Materials for tension springs 15 Materials for stiffing rings 15 SEALING FUNCTIONS Sealing to the housing bore 17 Dynamic sealing mechanism 21 OPERATING CONDITIONS Temperature and pressure Media to be sealed INSTALLATION SPACE AND CONSTRUCTIVE RECOMMENDATIONS 28 INSTALLATION QUALITY ASSURANCE SHAFT REPAIR SLEEVES The information contained herein is considered to be reliable, but no assurances, warrants or guarantees whatsoever, of any...

The Freudenberg Group was founded in 1849 and is still owned by the approximately 300 descendants of the c ompany founder. The resulting financial stability and social awareness are decisive success factors that create trust. Today, Freudenberg is a global, broadly diversified group of companies divided into Business Groups that operate in a wide variety of sectors. The company has always been c onsidered an innovation and technology leader, from Vileda® brand household products to technically complex sealing solutions. Freudenberg Sealing Technologies (FST) is the largest B usiness Group...

INDUSTRY-SPECIFIC AND CUSTOMIZED SERVICE CONCEPTS PRODUCT PORTFOLIO OF THE DICHTOMATIK BRAND ONLINE ORDERING PLATFORM EASY STATIC APPLICATIONS TRANSLATIONAL MOVEMENTS The EASY online ordering platform enables easy order p rocessing, as well as price, delivery time and stock queries around the clock. Besides detailed product information, installation space and cross-sectional drawings are a vailable for download. The EASY Business Connector is used to transfer your orders directly to your SAP system. This ensures that you are always up to date on the status of your order. Register today if...

COMMON STANDARD DESIGNS Profile W-shaft seal A-elastomer outer covering S-protective lip * Additional profiles can be found in the e-Catalog or on page 11 B-metal outer surface C-metallic outer surface with additional stiffening ring CONSTRUCTION RADIAL SHAFT SEALS Radial shaft seals are used to seal rotating machine elements such as shafts, hubs and axles in a wide range of industries: You’ll find detailed information on our products and the available certifications and conformity tests in our e-Catalog or on our online ordering platform EASY. DRIVE TECHNOLOGY, E.G. GEAR CONSTRUCTION...

Circum ferenti • good static sealing with low-viscosity or gaseous media • good resistance to many mineral oils and greases • FKM: broad resistance to chemicals and solvents • suited for use with grease seals 0 (0) • good static sealing with low-vis cosity or gaseous media • use with compressive loads • good resistance to mineral oils and < 1 (10) greases • FKM: broad resistance to chemicals and solvents OVERVIEW RADIAL SHAFT SEALS PTFE + carbon fiber FKM • good resistance to various mineral oils and greases • tight and precise fit good static sealing with low-viscosity or gaseous media...

Various standard and special materials are available for Dichtomatik radial shaft seals, depending on the model and the area of application. The starting material for elastomers is rubber, which can be obtained as natural rubber, but is mainly produced today as synthetic rubber in the chemical industry. Elastomers are distinguished by the underlying base polymer. The final material is produced by mixing the base polymer with appropriate fillers, plasticizers, processing aids, vulcanizing agents, accelerators and other additives. This process makes it possible to achieve the desired material...

SPECIAL MATERIALS A wide range of radial shaft seals come available in two varieties of elastomer and two types of PTFE materials: In addition to the standard materials described, various special materials are also available for special applications. These include material variants with lower friction properties due to sliding-intensifying fillers such as graphite or molybdenum disulfide (MoS2), as well as optimized materials for better resistance to media and temperature. Additional material variants in other hardnesses and colors are available on request. STANDARD ELASTOMER MATERIALS FOR...

SEALING TO THE HOUSING BORE To ensure reliable sealing against a wide variety of media when installed, an overlap (interference fit) of the shaft seal ring to the housing bore must be guaranteed under all operating conditions. Both the manufacturing tolerances of the housing bore and its expansion, e.g. due to the rise in temperature during operation, must be taken into account. In addition, care must be taken that the roughness of the housing bore is not too great to avoid "creep" of the medium to be sealed through this rough structure. If the roughness is too low, this can vastly increase...

DESIGN OF THE OUTER SURFACES – INFLUENCE OF THE DIFFERENT MODELS Radial shaft seals are typically offered with an elastomer outer covering or a metallic outer surface and are also available with an additional protective lip. SMOOTH, ELASTOMER-COATED OUTER SURFACE: MODELS WA, WAS Advantages: very • good static sealing can • be used for split housings, with possible edge breakage and/or butt offset use • with light metal housings with high thermal expan- sion or with all housings that have a greater coefficient of expansion than steel use • with low-viscosity or gaseous media use • in...

DYNAMIC SEALING MECHANISM SEALING EFFECT WITH A ROTATING SHAFT PARTLY ELASTOMER-COATED OUTER SURFACE: MODEL WAB The so-called “half-shoulder design” is a special design that is not covered as standard. It combines the advantages of models WA (rubber-covered outer surface  good sealing effect) and WB (metallic outer surface  a tight fit). Several conditions must be met to ensure that the contact area is lubricated during operation, but that no oil can escape to the outside. The geometry of the sealing lip must meet certain geometric criteria when installed: the • oil angle “b” of the...