Niro Soavi S.p.A
2.13. OPTIONS
2.13.1 SECOND STAGE HOMOGENIZING VALVE
As an option, a second homogenizing stage can be installed on NIRO-SOAVI
Homogenizers in series with the first stage valve.
In this way it is possible to reduce the increase of viscosity produced by the
treatment of the product, in case it contains colloidal or thickening substances.
Although the micronization effects obtained with the 1 stage are unaffected, the
2nd homogenizing stage reduces the product viscosity and allows the
distributing of the pressure drop.
Moreover, it is possible to avoid the clustering of micronized particles, due to
the homogenizing effect.
The application of the 2nd stage should be decided on the basis of specific
considerations concerning the type of product.
As a general rule, the second stage pressure is usually applied as 1/10 to 1/5 of
the maximum homogenizing pressure, according to the processed product
requirements.
The formula which relates the homogenizing pressures in a two stage system
(see figure 2.13.1) is the following:
Ptot = P1 = P2 + dP
where:
Ptot = P1 is the total pressure measured on the compression head,
equivalent to the 1st stage pressure
P2 is the pressure applied to the 2nd stage
dP = P1 - P2 is the pressure difference between the 1st and the 2nd stage,
applied in the passage through the 1st stage valve.
Do not hesitate to contact NIRO-SOAVI for advice and clarifications.
2C001E0C.DOC 2.13.1
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