Niro Soavi S.p.A
4C042E0C.DOC 4.4.13
• Position the delivery manifold, and tighten the nuts using the torque values
specified in table 4.3.1. When tightening proceed gradually through ALL the
nuts and tighten them in circle with all the other parts of the head in place.
• Position the retaining flanges of the suction valve assemblies, or the
complete suction manifold if made as one single elements (depending on
machine model), and tighten all the nuts using the torque values specified in
table 4.3.1
• Mount the suction manifold
WARNING: when tightening the head nuts observe the tightening torques
shown in chapter 4.3, Table 4.3.1; use a torque wrench (not provided).
4.4.4 VALVE SEATS
Valve seats (figure 4.4.5 e 4.4.6, item E) are of removable type; they are made
from a particularly hard material to ensure wear resistance and longer lifetime.
Possible light marking by pricks on seat surface does not affect the valve
sealing and functionality.
The lifetime of the seats is normally longer than the one of the valves, and
depends on the characteristics of the product and on the working conditions of
the machine.
In case of particularly abrasive products, seats can be refurbished or replaced
when necessary.
To do this you need to remove the seats from their housing (figure 4.4.5 e 4.4.6,
item A); a press may be needed both for disassembly and then for re-assembly.
Once the seats have been installed, the operating pressure of the machine will
block them into position, so it is important to increase pressure very gradually
when the machine is first started-up after replacements.
To aseemble and disassemble the valve groups follow the directions at
paragraph 4.4.3.
CAUTION: The tools used for removing the valve seats are NOT included
in the maintenance box. Tightening of the head nuts must be made using
the torque values indicated in chapter 4.3, Table 4.3.1.; use a torque
wrench (not supplied).
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