SKF LUBRILEAN Vario, Operating Instructions Manual

Page: 16 / 32

Assembly Page 16
EN
9.2 Rotary joints and spindles
Only rotary joints must be used that
are constructed for dry running.
The low quantities of lubricant used in the
minimal quantity lubrication system are
insufficient for lubricating the rotary joints.
Considerable damage to the machine tools can
result if this warning is not observed. Please
contact and consult the machine manufacturer
to find out whether the rotary joint of the
machine tool is suited for dry running.
Rotary joints and spindles with built-in
back pressure valves must be
modified.
Machine manufacturers often build back
pressure valves into rotary joints and spindles.
These back pressure valves have to be removed
because otherwise it is impossible to ensure
that they will be fully opened by the low
operating pressure of the MQL systems. The
sufficient lubrication of the machining process is
therefore not guaranteed.
Please consult the machine tool manufacturer to
find out how the back pressure valves can be
removed.
9.3 Compressed air connection
Before connecting your MQL system
to the compressed air supply, make
sure that the main air valve is closed.
The MQL system L
UBRI
L
EAN
®
Vario is equipped
with an NG8 connection socket for hoses with
an internal diameter of 7-8 mm for the
connection to the compressed air supply.
Please observe the specifications compiled in
Table 2 for the compressed air that will be used.
The MQL system L
UBRI
L
EAN
®
Vario is working
and functional with a primary pressure of at
least 6 bar. The full output of the system is,
however, only possible with a primary pressure
of 8 bar.
The MQL system L
UBRI
L
EAN
®
Vario
must only be operated with a primary
pressure of 10 bar at the most. Higher
pressures pose dangers to persons
and machines.
Table 2. Compressed air requirements
Requirements Values
Maximum primary pressure in
system 10 bar
Minimum primary pressure 6 bar
Supply pressure for discharge
of 1200 normal litres/min max. 6 bar
excess
pressure
Compressed air quality
standard in accordance with
ISO 8573-1 5
maximum particle size 40
μ
m
maximum particle density 10 mg/m³
maximum pressure dew point +7 °C
maximum lubricant
concentration 25mg/m³