Air Flow; Oil System - Atlas Copco XAXS 600 Cud Export PNE Instruction Manual

AIR FLOW

Air drawn through the airfilter (AFce) into
the compressor element
compressed. At the element outlet,
compressed air and oil pass into the air
receiver/oil separator (AR/OS).
The check valve (CV) prevents blow-back
of compressed air when the compressor is
stopped. In the air receiver/oil separator
(AR/OS), most of the oil is removed from
the air/oil mixture.
The oil collects in the receiver and on the
bottom of the separator element.
The air leaves the receiver via a minimum
pressure valve (MPV) which prevents the
receiver pressure from dropping below the
minimum working pressure, even when
the air outlet valves are open (specified in
section Limitations).
adequate oil injection and prevents oil
consumption. The minimum pressure
valve (MPV) also functions as a check
valve.
The system comprises temperature switch
(TS).

OIL SYSTEM

The lower part of the air receiver (AR)
(CE) is serves as oil tank.
Air pressure forces the oil from the air
receiver/oil separator (AR/OS) through the
oil cooler (OC), the oil filters (OF) and the
oil stop valve (OSV) to the compressor
element (CE).
When the compressor is stopped, check
valve incorporated in the unloader valve
prevents the oil from flowing back from
compressor element to air filter.
The compressor element has an oil gallery
in the bottom of its casing. The oil for rotor
lubrication, cooling and sealing is injected
through holes in the gallery.
Lubrication of the bearings is ensured by
oil injected into the bearing housings.
This ensures
The injected
compressed air, leaves the compressor
element and re-enters the air receiver,
where it is separated from the air as
described in section Air flow. The oil that
collects in the bottom of the oil separator
element is returned to the system through a
scavenging line (SL), which is provided
with a flow restrictor (FR).
The oil filter by-pass valve opens when the
pressure drop over the filter is above
normal because of a clogged filter. The oil
oil, mixed with the
- 23 -
then by-passes the filter without being
filtered. For this reason, the oil filter must
be replaced at regular intervals (see section
Preventive maintenance schedule for
the compressor).
Compressor does
Thermostat so do not operate
Compressor in
below 0 °C temperature.
not have
environment