The ferrofluidic seal GT6 for rotating process equipment has just been awarded the German TA-Luft certification. Recorded were leakage rates between 4 x 10-10 mbar l/s under static conditions and 1.9 x 10-5 mbar l/s at a shaft speed of 3000 rpm. The seal uses a magnetic liquid O-ring (ferrofluid stage) held in place by permanent magnets. Together with a magnetically permeable shaft or shaft sleeve it produces a zero leakage non-wearing seal. Each ferrofluid stage functions up to a pressure of 200 mbar. Several O-rings or ferrofluid stages can be used in series to produce a seal which will operate at higher pressures.
AP&T
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Further information cpp 226
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