The Nozzles's impeller/distributor is the key component in separating the fines from the larger particles. The impeller/distributor rotates on two sets of sealed bearings at relatively slow RPM, and is driven by the power of the particulate stream. Centrifugal force applied along the curved path of the impeller surface thrust the heavier particles toward the wall of the Nozzle body. As the heavier particles, by nature of their greater density, travel farther than the lighter dust particles, the heavier particles actually reach the wall and continue their spiral path downward while the boundary later effect causes the lighter dust particles to eddy over the impeller's edge and fall closer to the center of the Nozzle. The finer the particle, the near it comes to acting like a true fluid in this boundary layer separation.
The valve at the bottom of the Nozzle is made up of a series of overlapping flexible leaves or blades. The flow volume of the Nozzle is balanced to a given flow rate range by a system of adjustable lever arms which maintain the required pressure on these blades.
Initially, this valve interrupts the flow of material sufficiently to build up a head of material in the valve and lower part of the Nozzle. This retained head of material acts as an air stop to: 1) remove entrained air from the material, and 2) to keep any air from escaping the Nozzle which might turbulize the exiting stream of material. As this retained head of material is built up the pressure of the material continues to open the valve which works to maintain a constant retained head of material and a compacted exited stream.
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