Operation Manual
RENNER Compressors
2 Machine Description
2-7
2.3 Compressor unit (contd.)
Minimum pressure valve (contd.)
This pressure is necessary to ensure the oil supply to the
compressor unit. This minimum pressure is also required for
good oil separation.
2) As a non-return valve it prevents the compressed air from the
compressed air system or from the pressure chamber from
flowing back to the compressor unit. This function allows the
separator tank to be totally relieved of pressure when switched
off.
The valve operates automatically. The minimum pressure valve
may only be adjusted by personnel duly authorised by the
manufacturer!
Trap cartridge (item 7)
The trap cartridge is the oil separator element of the
compressor unit and serves to recover the dispersed residual
oil from the compressed air in droplets after pre-separation.
This cartridge is designed as a screw-on/screw-off type and is
secured on the filter support of the separator tank by means of
connection nipples (cf. Fig. 4).
Diagram of trap cartridge
Oil scavenge sight gauge / oil scavenge non-return valve
The sight gauge is located near the oil separator cartridge and
indicates the level of oil separated in the cartridge.
When the compressor is started the level indicator reads full
due to the accumulation of oil during standstill. After a few
minutes a mixture of air and oil is indicated, demonstrating that
oil separation is taking place in the cartridge.
If no oil is visible in the sight gauge after a relatively long period
of operation this may be an indication of damage, e.g. a
clogged borehole. As a consequence the oil separated in the
cartridge will be conveyed to the air mains via the compressed
air.
Problems of this kind may only be rectified by personnel
duly authorised by the manufacturer!
Description
Compressor unit
components
(contd.)
sealing
return oil
compressed air
from
separator
