Leading Particulars; Description Of Safety Pictograms Used In This Manual; General Description - Atlas Copco XAS 127 Kd Instruction Manual

Leading particulars

DESCRIPTION OF SAFETY PICTOGRAMS
USED IN THIS MANUAL
This symbol draws your attention to
dangerous situations. The operation
concerned may endanger persons and
cause injuries.
This symbol is
supplementary information.
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GENERAL DESCRIPTION

followed by
The compressors type XAS 127 Kd - XAS 275 KD7,
XA(S) 137 Kd - XA(S) 300 KD7, XA(S) 137 KdG -
XA(S) 300 KD7G and XAHS 107 Kd - XAHS 225
KD7 are silenced, single-stage, oil-injected screw
compressors, built for a nominal effective working
pressure, ranging from 7 bar (102 psi) up to 12 bar
(175 psi) (see chapter Technical specifications).
Engine
The compressors are driven by a liquid-cooled diesel
engine.
The engine's power is transmitted to the compressor
through a heavy-duty coupling.
Compressor
The compressor casing houses two screw-type rotors,
mounted on ball and roller bearings. The male rotor,
driven by the engine, drives the female rotor. The
element delivers pulsation-free air.
Injected oil is used for sealing, cooling and
lubricating purposes.
Compressor oil system
The oil is boosted by air pressure. The system has no
oil pump.
The oil is removed from the air, in the air/oil vessel at
first by centrifugal force, secondly by the oil separator
element.
The vessel is provided with an oil level indicator.
Regulation
The compressor is provided with a continuous
pneumatic regulating system and a blow-down valve
which is integrated in the unloader assembly. The
valve is closed during operation by air receiver
pressure and opens by air receiver pressure via the
compressor element when the compressor is stopped.
When the air consumption increases, the air receiver
pressure will decrease and vice versa.
This receiver pressure variation is sensed by the
regulating valve which, by means of control air to the
unloader and engine speed regulator, matches the air
output to the air consumption. The air receiver
pressure is maintained between the pre-selected
working pressure and the corresponding unloading
pressure.
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