3 Mounting and installation
50 Festo – MPAL-VI-EN – 2017-07a – English
3.4 Compressed air preparation
Note
Unfiltered or incorrectly lubricated compressed air will reduce the service life of
the valve terminal.
3.4.1 Operation with unlubricated compressed air
Note
An excess of residual oil content in the compressed air will cause valves to malfunction,
and will cause the life-time lubrication necessary for unlubricated operation to be
washed out.
Maintain the residual oil content
– Bio-oils (oils based on synthetic or natural ester, e.g. rapeseed oil methyl ester):
Residual oil content max. 0.1 mg/m
3
èISO8573-1:2010[–:–:2]
– Mineral oils (e.g. HLP oils acc. to DIN 51524, Parts 1 to 3) or similar oils based on
polyalphaolefins (PAO):
Residual oil content max. 5 mg/m
3
èISO8573-1:2010[–:–:4]
3.4.2 Operation with lubricated compressed air
Note
Operation with lubricated compressed air will cause the life-time lubrication, which is
necessary for unlubricated operation, to be washed out.
If the system was commissioned with lubricated compressed air, a changeover to
unlubricated compressed air is not possible.
Operation with unlubricated compressed air protects the environment. Festo pneumatic
valves and actuators, if used as intended, require no additional lubrication and still
achieve a long service life.
If lubricated compressed air is absolutely essential, the quality of compressed air pre
pared with the compressor must correspond to that of unlubricated compressed air.
Do not operate the entire system with lubricated compressed air.
Install the lubricators for dispensing additional oil directly upstream of the consuming
actuators.
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