Niro Soavi S.p.A
When the grooves reach the external diameter, the homogenizing efficiency
collapses, therefore the component should be replaced either when the grooves
cover nearly 3/4 of the useful surface or whenever a reduced homogenizing
efficiency is noticed.
In some cases, because of extreme wear of the parts, the homogenizing
pressure cannot be achieved anymore, therefore the complete homogenizing
valve must be replaced.
Some local cavitation effects may sometimes create some craters or strong
wear path on the valve surface, therefore it is necessary to proceed with
replacement of the parts.
As far as the impact ring (figure 4.5.1 pos. C), it has the dual function of
completing the homogeneization by impact and protecting the body of the
homogenizing assembly from erosion.
Due to wear, a groove (S4) is produced on its internal surface, and good
performance is undermined.
We recommend replacing the ring when the groove is approximately 1 mm
deep.
CAUTION: the impact head and the passage head are manufactured from
a material whose hardness is suitable to withstand the abrasive action of
the product handled for a long time.
Whenever wear signs appear that may jeopardize the homogenizing
efficiency, working surfaces can be rectified to remove max 1 mm of
material: this can be done either at NIRO-SOAVI or at properly equipped
workshops.
ATTENTION: The above mentioned indications are related to normal
conditions and are general guidelines for ordinary and preventive
maintenance.
It in necessari to mention that the wear of the components of the
homogenizing valve is something absolutely NORMAL, and depends on
the various phenomenons which take place inside the homogenizing
valve. In case the wear of the valve is considered too fast, please contact
NIRO SOAVI for advice and possible alternative solutions.
4c053e0c.doc 4.5.2
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