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Operating principle

The material to be separated is fed directly into the zig-zag separator via a rotary valve and is distributed over the complete sifter channel cross-section. The sorting air generated by the blower flows through the sifter from bottom to top, whereby the bulk material is flushed and separated.

The product must cross through the air flow at every bend of the sifter channel and then bounces off the opposite sifter wall. Here, the material with a higher density sinks in the sifter channel due to gravity. The light fraction is extracted from the sifter channel by means of the upwardly directed air flow.

The air speed of the fan is set by the customer’s frequency converter. For maintenance and service work, the zig-zag separator has maintenance doors on both sides and the rotary valves are equipped with maintenance access.

The depth of the wind sifter is adjustable and can be operated in exhaust air as well as air recirculation mode. The extracted air is cleaned via a downstream filter unit or a cyclone separator.


The machine separates a wide variety of bulk materials according to their specific weight, shape and size.


Depending on the individual application or abrasiveness of the material to be separated, various wear housing versions are available, e.g. HARDOX, PU, stainless steel, ceramics.

Complete design in stainless steel as well as surface treatments according to requirements are also available.