Deublin of USA specialises in the manufacture of rotating unions. For different requirements involving transfer of media for cooling, heating, activating, Deublin offers unions specially to meet these requirements. Water service unions supply water to cool the shafts in hammer mills used in the processing of powders and dry chemicals. Flakers and flaking mills also use water service unions while blenders have similar application to cool the rolls. Ball and pebble mills which grind pigments also need water service unions for water cooling of the heated rolls. Steam service unions supply high temperature steam at 280oF to conical blenders used in the processing of dry chemicals. Drying rolls and also hollow screw dryers require steam service unions for thermic fluid heating. To change the pitch of blades on variable pitch fans, air service unions supply air for activation of cylinders, pulleys and diaphragm chucks.