Rotary union
Rotocal
GAT
Radial rotary unions for shaft diameters from 200 mm to 3000 mm
Pressure up to 100 bar at a simultaneous rotation speed up to 20 m/s
Low friction losses
Very low leakage losses
For all throughput rates
For all media
Design and Function
Rotocal is a patented sealing system for large shaft diameters. The purpose of the design was to lessen the heavily increasing friction and leakage losses with large shafts. Therefore, sliding shoes are used in the stationary part of the rotary union for carrying the medium, which only have a fraction of the circumference of the shaft, and are also hydrostatically released, in order to minimize the friction and wear. The shoes glide along a valve ring that is moistened with the medium. The valve ring sits on the shaft and turns with it. The valves that are in the area of the pressure chamber of the shoe are opened by the pressure of the medium, and transport the medium into the shaft. When the valves turn so that they are no longer in the pressure chamber, they close and thus prevent a loss of the medium through the valve ring.
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