Niro Soavi S.p.A
4.5. HOMOGENIZING GROUP
4.5.1 HOMOGENIZING VALVE
The homogenizing valve consists of 3 parts (figure 4.5.1):
- lower head or passage head (A)
- impact head (B)
- impact ring (C).
The homogenizing effect occurs - at very high speed - during the passage
between the exposed surfaces of the two heads, and is completed by the
impact with the external ring.
The high pressure fluid dynamic effects which take place inside the
homogenizing valve are extremely complex; generally speaking it is possible to
describe the micronization of the particles dispersed in the liquid phase as a
resulting of combined turbulence, shear, local cavitation and high speed impact
effects.
These three parts, manufactured from very hard material, are normally subject
to more or less wear, depending on the type of product handled; therefore,
various effects resulting from wear or damage can be noticed on their surface:
- radial grooves developing from the internal diameter (fig. 22.14-S1);
- small craters next to the external diameter (fig. 22.14-S2);
- large craters and wear next to the internal diameter (fig. 22.15-S3).
S2
C
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