Sealing technology manual for the process industry

THE ADVANTAGES AT A GLANCE • Highly resistant to nearly all chemicals • Can be used universally • Tool-independent dimensions, many standard dimensions available in stock DESIGN NOTES Coarseness No more than 50 µm on contact surfaces Lead-in chamfers Chamfer angle of 30° to 40°, length must be min. 50% of the cord thickness Preparation • Any parts that come into contact with the seal during assembly or in operation must be clean and free of flash • All edges must be rounded • Given the reduced elasticity and compressibility of the ring, the installation space should be axially accessible • Otherwise, extra care should be given to using clean, smooth and flash-free pins or mounting sleeves • After insertion in the groove, the ring should return to its normal dimensions Outside sealing – grooves on shafts: • Use an assembly aid for installation • Soak the ring in hot water for 10 minutes, then slide over the installation aid quickly and smoothly until the ring snaps into the groove • If necessary, compress the ring to its original form by means of a second ring (by applying pressure) Applications FEP/PFA-encapsulated O-rings are primarily used in chal- lenging applications: • With aggressive media that require universal chemical re- sistance • In case of high thermal stresses at high and low temper- atures • For applications in equipment in the food and beverage industry using different media and aggressive cleaning agents • In small quantities as an economical alternative since no tools are necessary for manufacture Dimensions • Cross-sections from 1.6 to 25.4 mm • Internal diameters from 10 to 600 mm • Special dimensions available on request Outside sealing – grooves on shafts APPENDIX PRODUCT PORTFOLIO MATERIALS RESISTANCE & PURITY ENGINEERING PLASTICS ELASTOMERIC MATERIALS TECHNICAL FUNDAMENTALS INTRODUCTION 69

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