Lip seal TRO-I series

PTFEPURcompression

Tandem Seal, friction optimized, inside sealing Single acting rod seal with improved performance in regard of static and dynamic friction. Influencing seal friction and and efficiency can be approached by changing material composition or implementing différent kinds of fillings as well as by changing the design or geometrical shape of com- ponent parts. Components of PUR energizer and PTFE-Compound slide ring have been completely new designed and adjusted resulting in a new kind of tandem rod seal called TRO-I. Perfomance in regard of static and dynamic seal friction was significantly improved with this smooth-running further development. The new slide ring design almost extends over the whole width of PUR-energizer and supports also the back of seal which leads to low friction contact between PTFE and cylinder rod under system pressure and axial compression of the seal. Pressure averted side of slide ring has a modified step-seal shape for positive effect on the hydrodynamic back pumping of dragged out fluid films and to avoid a pressure build up between tandem arrangement of seals. Shape of slide ring also leads to an improved protec- tion against gap extrusion under pressure loadings. This new design reduces heat génération by friction and allowes considerably higher movement speeds of the system. Adherence, sticking or stick-slip effects due to high breakaway forces is avoided. TRO-I seal can be combined in tandem arrangements as primary or secondary seal - as well as redundant double set up for applications where spécial requirements regarding leak tightness is needed.