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Leading particulars
Description of Safety Pictograms Used in this
Manual
This symbol draws your attention to
dangerous
situations.
concerned may endanger persons and cause
injuries.
This symbol is followed by supplementary
information.
GENERAL DESCRIPTION
The
operation
The XAS 185 KD is a silenced, single-stage, oil-injected
screw compressor, built for an effective working pressure
of 102 psi (7 bar).
Engine
The compressor is driven by a liquid-cooled diesel engine.
The engine's power is transmitted to the compressor
through a flexible 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 male
rotor has four lobes and the female rotor has six flutes.
Thus, the male rotor revolves at 1 1/2 times the speed of
the female rotor. The element delivers pulsation-free air.
Injected oil is used for sealing, cooling and lubricating
purposes.
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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
first by centrifugal force, second through the oil separator
element. The vessel is provided with an oil level indicator.
Regulation
The compressor is provided with a continuous regulating
system and a blow-down valve which is integrated in the
unloader assembly. The valve is closed during operation
by outlet pressure of the compressor element and opens by
air receiver pressure 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
Cooling system
Engine and compressor are provided with a radiator and
oil cooler. The cooling air is generated by a fan, driven by
the engine.
Safety devices
A thermal shut-down sensor protects the compressor
against overheating. The air receiver is provided with a
safety valve. The engine is equipped with low oil pressure
and high coolant temperature shut-down sensors and an
alternator/V-belt protection system.
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