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Leading particulars
GENERAL DESCRIPTION
The DU-190 are silenced, single-stage, oil-injected
screw compressors, built for a nominal effective
working pressure of 7 bar (101.52 psi).
Engine
The compressors DU-190 are driven by a 4 cylinder
in-line liquid-cooled diesel engine.
The engine’s power is transmitted to the compressor
element 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
compressor 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
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-off 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 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 an electronic 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
The engine is provided with a liquid-cooler and
intercooler and the compressor is provided with an oil
cooler. For available options see section
.
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.
Summary of Contents for DU-190
Page 1: ...8 Instruction Manual English...
Page 2: ......
Page 16: ...16 Main Parts...
Page 18: ...18 COMPRESSOR REGULATING SYSTEM...
Page 22: ...22 CONTINUOUS PNEUMATIC REGULATING SYSTEM...
Page 60: ...60 ELECTRIC SYSTEM Circuit diagram 9829 3801 10...
Page 61: ...61 Circuit diagram 9829 3801 10...
Page 62: ...62 ELECTRIC SYSTEM Wire harness 1094 3133 02...
Page 67: ......
Page 68: ......