Chicago Pneumatic CPS 750, Инструкция по эксплуатации, Страница: 27 / 94

Instruction Manual
1310 3012 02 27
CPS
2.4.3 Oil system
The lower part of the air receiver (AR) serves as oil tank.
Air pressure forces the oil from the air receiver/oil separator (AR/OS) through the oil cooler (OC), the oil
filters (OFce) 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) opens when the oil temperature is above 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
2.4.2 Air flow . The oil that collects in
the bottom of the oil separator element is returned to the system through a scavenging line (SL), which is
provided with a flow restrictor (FR).
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
4.5 Preventive maintenance schedule for the compressor ).