Christian maier gmbh of germany manufactures h/hw series rotary joints, which are ideal for steam and hot oil. Water can also be used at low rpm. The advantages of the rotary unions are: two bearings with housing bearing locked to avoid rotation and the seal ring resistant to friction even at high pressures. The rotary unions are very easy repairable, maintenance free and they need no lubrication. Housing, rotors and rotor pipes included in the rotary unions, are built of cast iron, steel or chrome steel, depending upon model and size. The sealing elements used in these unions are made of highly wear resistant artificial carbon and sealing ring is pressure loaded. Both the seal and bearings need little maintenance. Wear indicator for sealing ring is fitted with the rotor. Radial and axial housing connection is established with right hand thread bsp [iso 228].
