All closed type sand mills are provided with 2nos: Motors for impeller and pump, Fluid Couplings, Pumps with Speed Variators.
The closed type sand mills are capable of dispersing primers and even red oxide metal primer, blacks, blues, maroon etc. using steel balls or zirconium beads also called as steel ball mills etc. They have a distinct advantage over the ball mill as HP consumed is less time to complete the batch is also faster. The batch size can also be varied according to the production needs.