Niro Soavi S.p.A
4C042E0C.DOC 4.4.1
4.4. COMPRESSION HEAD (MULTI-BLOCK VHP)
ATTENTION: The compression head maintenance operations require to
remove the head guard, unscrewing the side screws.
The machine should not be used if the guard is not correctly secured in
place.
ATTENTION: The head maintenance operations require disassembling the
parts which are secured by stud bolts and nuts.
When tightening them, refer to the torque values shown in Table 4.3.1 to
avoid imposing abnormal or excessive stress and undermining their
strentgh.
Before giving a description of maintenance operations, it is important to
remember that couplings in high pressure seal areas are made with O-rings,
made of plastic or elastomers, sometimes fitted with anti-extrusion rings, made
with materials suitable for contact with the products handled and capable to
withstand the temperatures reached by the machine.
It is good practice to replace the gaskets not only when clearly leaking or when
damaged, but also every time you are reassembling parts which are in contact
with the gaskets.
Gaskets should be greased with a food-grade lubricant and assembled with
non-sharp tools which might damage them; in any case keep in mind that forced
or incorrect assembling can affect the life and seal of gaskets.
To identify and position gaskets correctly, refer to the drawings provided herein
for the disassembling of compression head and its components and to the
general drawings in Section 5 – SPARE PART CATALOGUE.
These maintenance instructions refer in particular to very high pressure heads
Multi-Block VHP, especially designed and constructed with highly resistant
materials for safe and reliable performance under high-pressure operating
conditions..
ATTENTION: the compression head type Multi-Block VHP is built using
several parts connected together by studs and nuts. It is extremely
important to follow the correct assembling procedure to avoid possibile
misalignment of the parts with consequent not correct tightening of all the
gaskets. During assembly proceed carefully with progressive tightening
of ALL the nuts of the head one after the other and in cross, till the final
tightening with torque wrench (not supplied).
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