PTFE seal TRO-A series

PURpistoncompression

Single acting piston 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 different kinds of fillings as well as by changing the design or geometrical shape of component parts. Components of PUR energizer and PTFE-Compound slide ring have been completely new designed and adjusted resulting in a new kind of tandem piston seal called TRO-A. 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 mainly leads to low friction contact between PTFE and tube 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 or back to back arrangements of seals. Shape of slide ring also leads to an improved protection against gap extrusion under pressure loadings. This new design reduces heat generation by friction and allowes considerably higher movement speeds of the system. Adherence, sticking or stick-slip effects due to high breakaway forces is avoided. Therefor TRO-A can be used for low friction applications where special requirements regarding leak tightness or positioning accuracy is needed.