Niro Soavi S.p.A
vibrations and resonance, which may cause reduction of homogenizing
efficiency and can be dangerous for the machine itself.
Ordinary maintenance operations are listed below:
- Check regularly the oil level inside the damper tank through the sightglass
- Check regularly into the damper tank the correct pressure value: must be
0,5 bar with machine stopped
- In case refilling of oil is required, close the valve (J) and open slowly the
upper filling plug (there is pressure inside); once the pressure is gone, fill
the necessary oil quantity. The pscifications of the suitable oil are listed on
table 4.10.2
WARNING: the damper tank containing oil is under pressare; open
carefuly and slowly to allow air pressare go down and avoid danger
for personnel.
- Close the upper plug and connect a compressed air source to the quick
connection (M) to restore the pressure of 0,5 bar inside the damper tank
- Open the valve (J) and check if the air pressure is still at the set value of 0,5
bar
Pressure inside the camper tank cannot be higher than 0,6 bar when the
machine is stopped.
Oil into this circuit does not requie any ch’ange but only refilling in case the level
is low.
If during the above mentioned procedures of filling up, or during the
homogenizing valve maintenance some air bubbles are present into the plastic
pipes, it is possible toeliminate the same by application and release of the
pressure to the actuator through the pneumatic switch (C), with machine
stopped and with the manual pressure regulato set to allow some air to go
through (not at zero).
The presence of air bubbles, anyway, cannot prevent the system to work
properly, even if the dampening effect may be sometimes reduced.
The adjustment of the throttle valve (E, H) allows to regulate the speed of the
homogenizing pressare raise.
Usually the setting of this valve is made during the machine test, in order to
avoid a sudden raise of the homogenizing pressure which may cause the
opening of the overpressure relief valve.
Before making any modification to the setting, please tae note of the original
setting on the scale in order to recover the original setpoint in case of need.
As general information the closing of the valve (H) is slowing down the pressure
raise, its opening is making it faster.
4c101e0c.doc 4.10.3
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