CHRISTIAN Maier GmbH & Co’s patented DQ series rotary joints are widely used for applications using thermal oil heating. They are represented in Australia by The Novasys Group Pty Ltd.
These are used on paper calenders, in non-woven or textile manufacture, on dryers, mixers or reactors, at temperatures up to 390 C and speeds up to 600rpm/min (even at 150mm or 200mm diameters), Maier DQ joints are proven in thousands of installations.
The DQ series use a double seal. The main seal is externally loaded to allow the rotation to work as a centrifugal force against leakage.
To better balance the energy and to protect the tapered roller bearings, a double wall rotor is used. The bearings themselves work in a separate cooling circuit, which also protects the main seal from contact with oxygen. This avoids cracking at the seals and enables a life-time of up to four years.
To transfer steam into high volume dryers or reactors, HWB series with spherical seal rings are used. The (usually) low speeds allow these designs to be produced in sizes up to 250mm diameter. This enables steam volumes of up to 15,000kg/hour.
If the steam volume needs to be higher again, the DC series can be used. This series is well proven in the new generation of paper calenders. The patented DC series mechanical seal is lubricated and cooled using outside condensate.