Denyo DU-190, Инструкция по эксплуатации

Страница: 21 / 68

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OIL SYSTEM
The lower part of the air receiver (AR) serves as an oil
tank.
Air pressure forces the oil from the air receiver/oil
separator (AR/OS) through the oil cooler (OC), the oil
filter (OFc) and the oil stop valve (OSV) to the
compressor element (CE).
When the compressor is stopped and / or there is no
pressure in the system, the oil stop valve (OSV)
prevents the oil from flowing back into the
compressor element.
The thermostatic by-pass valve (TBV) starts opening
when the oil temperature is 70 °C (158 °F).
The compressor element has an oil gallery in the
bottom of its casing. The oil for rotor lubrication,
cooling and sealing is injected through holes in the
gallery.
Lubrication of the bearings is ensured by oil injected
into the bearing housings.
The injected oil, mixed with the compressed air,
leaves the compressor element and re-enters the air
receiver, where it is separated from the air as
described in section
Air flow
. The oil that collects on
the bottom of the oil separator element is returned to
the system through a scavenging line (SL), which is
provided with a flow restrictor.
The oil filter by-pass valve opens when the pressure
drop over the filter is above normal because of a
clogged filter. The oil then by-passes the filter
without being filtered. For this reason, the oil filter
must be replaced at regular intervals (see section
Preventive maintenance schedule ).