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Sealing technology manual for the process industry

Pure PTFE L PTFE-impregnated synthetic fabric Spacers for balancing heights ø ø d D DESIGN NOTES Virgin PTFE/ PTFE compound V-Seal set packings • Due to their lack of elasticity and high degree of thermal expansion, V-Seal set packings must be preloa- ded using a spring device • The spring force should be tailored to the seal’s design, dimensions and operating conditions. The higher the spring force, the less leakage. The parameters can be requested from Freudenberg • When using a spring device for installation on the side turned away from the pressure, set the spring force to maximum pressure • For information on permissible installation space tolerances and the characteristics of their surfaces, please consult Freudenberg PTFE/fabric V-Seal set packings • Can usually be installed without spring pre-load • Installation space must be adjustable (see diagram) • Tolerances and surface characteristics match those of the virgin PTFE/PTFE compound variant General In the standard version, V-Seal set packings consist of a compression ring, a backup ring, and three V-packing rings Special installation notes In order to avoid damaging the seal during installation, the installation space and rods and/or shafts should include lead-in chamfers Composition and installation APPENDIX PRODUCT PORTFOLIO MATERIALS RESISTANCE & PURITY ENGINEERING PLASTICS ELASTOMERIC MATERIALS TECHNICAL FUNDAMENTALS INTRODUCTION 79

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