Atlas Copco XAS 127 Kd User Manual

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AIR FLOW
The system comprises:
AFce Air filter compressor/engine
AR/OSE Air receiver/oil separator element
CE Compressor element
UA/UV Unloader assembly with unloader valve
BDV Blow-down valve
Air drawn through the airfilter (AFce) into the
compressor element (CE) is compressed. At the
element outlet, compressed air and oil pass into the air
receiver/oil separator (AR/OSE).
The check valve (CV) prevents blow-back of
compressed air when the compressor is stopped. In
the air receiver/oil separator (AR/OSE), most of the
oil is removed from the air/oil mixture; the remaining
oil is removed by the separator element.
The oil collects in the receiver and on the bottom of
the separator element.
The air leaves the receiver via a restriction which
prevents the receiver pressure from dropping below
the minimum working pressure (specified in section
Limitations), even when the air outlet valves are
open. This ensures adequate oil injection and prevents
oil consumption.
A temperature switch (TS) and a working pressure
gauge (WPG) are comprised in the system.
A blow-down valve (BDV) is fitted in the unloader
assembly to automatically depressurise the air
receiver (AR) when the compressor is stopped.
OIL SYSTEM
The system comprises:
AR/OSE Air receiver/oil separator element
OC Oil cooler
OF Oil filter
The lower part of the air receiver (AR) serves as oil
tank.
Air pressure forces the oil from the air receiver/oil
separator (AR/OSE) through the oil cooler (OCce)
and oil filter (OF) to the compressor element (CE).
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.
The injected oil, mixed with the 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 scavenging line (SL), which is
provided with a flow restrictor.
The oil filter by-pass valve opens when the pressure
drop over the filter is above normal because of a
clogged filter. The oil 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).
Reference Name
SL Scavenge Line
SOV Solenoid Valve (Generator option)
SRE Speed Regulator Engine
SV Safety Valve
TSE Temperature Switch Engine
TSC Temperature Switch Compressor
UA Unloader Assembly
VI Vacuum Indicator
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Atlas Copco XAS 127 Kd Specifications

General

Brand	Atlas Copco
Model	XAS 127 Kd
Category	Air Compressor
Language	English