Leading Particulars; Description Of Safety Pictograms Used In This Manual; General Description - Atlas Copco ORV 10 Instruction Manual

Instruction Manual
2.

LEADING PARTICULARS

2.1 D
ESCRIPTION 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 followed by supplementary information.
Fig. 2.1 General view ORV/ORX
2.2 G
ENERAL DESCRIPTION
The ORV/ORX is a double-stage, oil-injected screw compressor
designed for power take-off application. The unit is built for a
normal effective working pressure of 16-25 bar(e) (ORV) or 19-30
bar(e) (ORX). The power from the prime mover is transmitted to the
compressor elements through a gear casing.
A large range of gears is available for many different input speeds
and different air outputs (FAD).
– Compressor
The compressor has one low-pressure and one high-pressure
compressor element. Each compressor element houses two screw-
type rotors, mounted on ball and roller bearings. The male rotor,
driven by the engine, drives the female rotor. The elements deliver
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, 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. The valve is closed during operation by outlet
pressure of the high-pressure 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, 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 compressor is provided with an oil cooler.
The cooling air is generated by a fan.
– Safety devices
Two thermal shutdown switches protect the compressor against
overheating. The air receiver is provided with a safety valve.
A minimum loading pressure switch prevents the compressor from
loading when the receiver pressure is too low.
A start prevention pressure switch prevents the compressor from
starting when the receiver pressure is too high.
– Bodywork
The compressor elements, air and oil filters, oil cooler and regulating
components are enclosed in a simple, weather-proof canopy. The
side panels are easily detachable by four quick fasteners. All fittings
to interconnect the two modules are centralized on a connecting
panel, situated at the left side of the compressor module.
The air filters may be serviced without removing a side panel.
All drain plugs are on the outside of the canopy to facilitate oil
change.
Transport beams are integrated in the frame for installation with a
fork-lift truck.
– Data plate
The compressor is furnished with a data plate showing the type,
serial number and normal working pressure (see chapter 8).
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