The SIMKO 300 seal ring is a polyurethane sealing solution from Freudenberg-NOK Sealing Technologies offers notable advantages over frequently used polytetrafluorethylene (PTFE) seals with regard to operating life, form stability and sealing characteristics.
Most sealing systems in piston accumulators work with two seals, one for oil and another for gas. This leads to increased wear due to the extreme load, especially in PTFE seals. By contrast, the SIMKO 300 is a single seal (consisting of a seal ring and a pressure ring) and is made of polyurethane. Polyurethane’s hardness grade of 98 Shore A corresponds to that of PTFE but is much more robust. Its susceptibility to potential surface damage during installation is also lower. The pressure ring creating the necessary pre-tension is made of an elastomer.
The SIMKO 300 seal’s high form stability, its surface firmness and its long operating life make it especially appealing for use in hydraulic pitch controllers in wind power facilities. They are an important component of the security technology in wind power facilities, as the piston accumulator must not merely function reliably under extreme weather conditions but also withstand the high differential pressures that are also produced. The accumulator must be able to operate leak-free over very long periods.
