In close cooperation with DVA Deutsche Vakuumapparate, Holland-Merten Burgmann has developed the seal HSHR35 for high pressure paddle dryers. The sealing of paddle dryers poses always a challenge for the sealing technology. Paddle dryers are mainly used in horizontal arrangement where the seal is partially in direct contact with the product. That means that on the one hand the product itself and on the other hand the gas phase has to be sealed. Therefore mainly double seals are used with pressurised barrier medium in these demanding applications. Beyond this, the requirements of the explosion safety regulation resp. the directive 94/9/EG (Atex 95) have to be considered in most cases. One more characteristic is the thermal expansion of the heated shaft which has to be compensated by the seal. In this specific application also the high pressure of 20 bar is an additional challenge.
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