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Sealing technology manual for the process industry - O-rings

O-RINGS As a universal sealing element, the O-ring is a sealing com- ponent used in all industrial sectors. It is characterized by its excellent price-performance ratio and broad range of applications. O-rings can be manufactured in nearly all conventional elastomer materials as a standard part in large quantities or in smaller quantities for customer-specific applications. In comparison to other sealing systems, the required instal- lation space is extremely small, allowing material-saving designs. Though simple in form, O-rings can nonetheless be reliably used in a variety of installation configurations: as static seals in axial or radial direction, or for dynamic applications involving translatory and/or rotary movements. Function • Static sealing for axial and radial applications • Dynamic sealing for applications with translatory and rotary movements Dimensions • Available in inch (US standard) and metric dimensions • Numerous intermediate sizes are also available thanks to our extensive inventory of tools • Special sizes of over 500 mm generally require new tools • Standardized cross-section diameters from 1 mm to 6.99 mm, smaller and larger dimensions available on re- quest Types • Compression- or injection-molded standard models • Special designs and large dimensions of endless extruded cord, spliced or vulcanized • In addition to round cross-sections, oval, rectangular, semicircular or x-shaped cross-sections are possible • Special, customer-specific types can be created with new molding tools • Surface-treated special designs such as non-stick and lubricated applications, painting, coating, nano-techno- logical modification for the optimization of function and application • PTFE casing (with separating joint) or complete FEP encap- sulation for use in highly corrosive media Possible cross-sections Installation and assembly • Edges should be rounded with at least r = 0.1 mm • If O-rings must be stretched over sharp corners or thread- ed parts due to the design of the application, these sur- faces should be covered with bushings/casings where possible • In radial sealing applications, there should be lead-in chamfers on the pistons/rods (on the housing) • When installing in pistons, avoid twisting. If necessary, use a compatible lubricant for easier assembly • For applications in the food and beverage industry, the use of coated O-rings is recommended (e.g. PTFE lacquer, RFN treatment) • When O-rings are installed in housings, the O-ring is compressed. Here it must be ensured that the O-ring does not warp (form a loop) • General installation and assembly instructions, see page 94 Product portfolio 66

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