Sealing technology manual for the process industry

Function • Dynamic sealing for applications involving rotary motion • Sealing pressure is generated by the special lip design and PTFE’s memory effect Dimensions • Manufactured by machining independent of molds, therefore no limits on any dimension • Standard dimensions from 10 to 125 mm shaft diameter available in stock • Smaller or larger dimensions available upon request Installation and assembly • Must always be assembled as a combination of sealing ring and retaining ring • If seal is disassembled, the clamping ring must be re- placed since it is deformed by the pressing operation • If possible, use pressing tools with built-in stops to avoid excessive axial compression and the risk of damaging the seal • To aid assembly, the rotary shaft seal can be lightly oiled if desired • If possible, disassemble the sealing ring from the inside using a shaft sleeve; alternatively, a bearing remover can be used, provided there is sufficient room. If the seal is damaged, replace the sealing ring • Please refer to page 94 for general installation and assem- bly instructions Applications Due to their variable designs, the HTS II rotary shaft seals offer an enormous application range for production pro- cesses involving the sealing of media, the separation of lu- bricants and media and the secure sealing of cleaning pro- cesses. Suitable for use in • Beverage filling facilities • Food and beverage production machinery • Process equipment used in pharmaceutical and cosmetics manufacturing • Mixers and separators • Machines with a high rotational speed • Cleaning and sterilization processes • The reliable sealing of dangerous substances and highly valuable production media THE ADVANTAGES AT A GLANCE • Variable and reliable use in the food and beverage industry • Highly resistant to media and temperatures • Dead space-free variants available for hygienic applications • Minimal abrasion • Available in all dimensions • Economical to use, as they make secondary seals un- necessary DESIGN NOTES General • HTS II rotary shaft seals must be installed as a unit consisting of a PTFE sealing ring and a stainless steel retaining ring • The retaining ring is deformed during installation and cannot therefore be reused • The installation space must be axially accessible • Lead-in chamfers on both the shaft and housing should be included to prevent ring damage Surfaces Peak-to-valley heights Ra Rt Housing <1.8 µm <10 µm Shaft, twist-free 0.1 to 0.2 µm 0.5 to 1.0 µm Hardness of running surface 45 to 65 HRC APPENDIX PRODUCT PORTFOLIO MATERIALS RESISTANCE & PURITY ENGINEERING PLASTICS ELASTOMERIC MATERIALS TECHNICAL FUNDAMENTALS INTRODUCTION 77

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