The operational safety of whole industrial plants is depending amongst others on the reliable function and tightness of valves. Therefore the sealing element stuffing box with packing is of great importance. For a suitable design of valves distinct characteristics of packings for stuffing boxes are required, describing the deformation, relaxation, friction, and tightness behaviour. These characteristics are defined and the testing procedures for their experimental determination are developed. Exemplary results lighten the typical and different performance of varied packing materials. Extensive characterisation of the materials mostly in use is subject of present testing programmes. Further on some ideas of topics for future research work are presented.
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