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Leading particulars
GENERAL DESCRIPTION
The XRYS 577 - XRYS 1260 is a silenced, two-stage,
oil-injected screw compressor, built for a nominal
effective working pressure of 35 bar (510 psi).
The XRXS 607 - XRXS 1275 is a silenced, two-stage,
oil-injected screw compressor, built for a nominal
effective working pressure of 30 bar (435 psi).
The XRVS 647 - XRVS 1350 is a silenced, two-stage,
oil-injected screw compressor, built for a nominal
effective working pressure of 25 bar (365 psi).
Engine
The compressors are driven by a 6 cilinder in-line
liquid-cooled diesel engine.
The engine’s power is transmitted to the compressor
element through a heavy-duty coupling.
To meet the demands of Stage IIIB / Tier 4 Interim
Emission Legislation, the engine is equipped with an
exhaust gas recirculation system and a particulate
filter.
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 XRYS compressor
The compressor is provided with a dual pressure
electronic regulating system.
The DrillAirXpert variable regulating system gives
full control of compressor pressure and flow.
It controls vessel pressure and outlet flow by
measuring air pressure and air temperature at several
points and steering the air inlet valve, engine speed
and blow off valve corresponding the values
measured.
Regulation XRVS and XRXS compressors
The compressors are provided with a single or dual
pressure 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 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 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.
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