The PIERALISI FPC-type series covers the range of small to medium size disc stack separators with automatic solid discharge. It is designed for the continuous separation of finely dispersed, regimenting solid parties from the entering mother liquid.

If necessary, two immiscible liquid phases of different density can be separated simultaneously in the same process step.

The product enters the feed zone of the separator bowl through a stationary feed pipe. The incoming liquid is accelerated to full rotational speed by means of the distributor.

The accelerated liquid flows outwards along the underside of the distributor disc.

When the zone of maximum g-force is reached, the flow direction changes, the liquid is conveyed towards the center of the bowl where it is discharged under pressure by means of a stationary paring disc. While flowing through the disc stack, the solid particles sediment towards the underside of the discs and then move towards the periphery of the bowl where they accumulate in the sludge space.

A hydraulically operated ring valve opens a number of peripheral parts at preset intervals, so the collected solids are discharged owing to the centrifugal force.

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The decanter is used for the separation of two or more phases of different specific gravity, in particular for the clarifying of liquids in which suspended solids are present. The separation of solids and liquids takes place within a cylindrical/conical rotating drum, upon the periphery of which the heavier solid phase collects and is continually removed by the internal conveyor.

A polyelectrolyte, suitably chosen for its type and specific characteristics, may be added to the product being fed to the machine in order to improve the solid-liquid separation. The polyelectrolyte favors the aggregation and thus the sedimentation of the solid particles. A polyelectrolyte is not always compatible with products being processed. It is generally used in purification processes for the drying of sludge, but not in intermediate product conversion processes, and even less in the processing of foodstuffs.

The ROTOVARIATOR – an electronically programmable electro-mechanical system – is designed and manufactured by the pieralisi group and patented worldwide for application on decanter centrifuges of the FP 600 and JUMBO series including already installed decanters. The ROTOVARIATOR automatically adapts the differential speed between bowls and conveyor to the process conditions and requirements:

• Maximum torque allowed on the reduction gear
• Percentage of dry solids in feed flow
• Percentage of dry solids required on dehydrated product
• Required separation efficiency, thanks to a frequency converter in combination with an intelligent control system.

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The SV series automatic discharge separators have been designed for the separation of the whey and of the buttermilk from production of milky buffalo cheese and are designed for the small and medium size dairy industries.

Their limited casts and simple operation make the introduction of automatic discharge systems much easier for those industries where only manual discharge separators have been traditionally used. As opposed to the MCS series centrifuges having two centripetal pumps, the new SV series units cannot be used as clarifiers. Milk standardization however can be carried out, but by means of a manual process only.

In addition, the SV separators feature improved operating stability due to the elimination of one centripetal pump and one regulating micrometric valve. The main features of these units are described hereafter.

The separated fat phase falls by gravity into a bucket on the floor, as traditionally done. It cannot be discharged under pressure.

The machine is regulated by acting on the backpressure valve of the skimmed milk phase (which is always discharged under pressure), thus greatly simplifying the use of the separator.

Since the cream does not go through the centripetal pump, but it drops out of the machine by gravity, the fat flock is not broken (that is, the butter making process is simplified), the cream life is longer and the taste of the final product is improved.

Sediments are always discharged automatically by the milk clarifier. Since the cleaning operation is done automatically, there is no need to disassemble the machine at the end of each production cycle. As a consequence, by eliminating this long, expensive, boring and even hazardous operation, production costs are reduced.

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