Oil Mist Remover System - Hitachi NEXT Series Instruction Manual

Oil-free rotary screw air compressor
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8.5 Oil Mist Remover System

OMR Relief Valve
Opens when pressure in
the gear case excessive-
ly rises to prevent inter-
nal pressure increase.
Vacuum Indicator
Indicates that the ejec-
tor is operating properly
and that the gear case
i n t e r n a l p r e s s u r e i s
Air Source
Removes dust particles
and condensate from
the air source.
When the compressor starts running,
oil mist is vented from the vent pipe.
When the line pressure rises,
the ejector actuates.
Negative pressure is maintained in
the oil mist remover.
Without increase of gear case internal pressure,
the high-performance remover element removes
oil mist.
Separated oil is
recovered in the gear case and reused.
The oil mist remover reduces oil consumption to almost zero. However, the oil should still be replaced
Remover Element
A high-performance
element to separate
fine oil mists.
Pressure Gauge
Maintains supply
Indicates supply pres-
pressure to the
sure to the ejector.
ejector constant.
Float Trap
Automatically collects oil
to the suction side of oil
pump when oil is accu-
mulated in the housing.
The incorporated ejector uses the compressed air to
generate a vacuum pressure, which maintains a negative
pressure on the oil mist remover subsystem. This
prevents the gear case internal pressure from rising due
to a resistance of the element.
By installing the oil mist remover:
There is no need to extend a gear case vent pipe
outdoors, avoiding any type of trouble that may be caused
by incorrect installation of the gear case vent pipe.
Oil mists are prevented from venting from the gear
case to atmosphere, keeping the compressor room/
area clean.
Oil expenses and labor costs to add extra oil are
lowered because the oil is automatically recovered in
the gear case.
Uses compressed air
to generate a vacuum
pressure, which main-
tains a negative pres-
sure in the housing.
Air End
Oil Pump
Gear Case
Solenoid Valve
Closes when the com-
p r e s s o r s t o p s r u n -
n i n g , s t o p p i n g t h e
consumption of air.

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