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8
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3.5 Oil return mechanism (Option)
Oil return mechanism is designed to return the trapped oil in oil mist trap to the pump. 3 models of oil
return mechanism are available according to the operating pressure and conditions.
Table.2 Oil return mechanism models
Oil return mechanism A
Oil returns into the pump case through the oil filling plug. The oil back to the oil mist trap is
prevented by the check valve.
CAUTION: The oil doesn’t returns to the pump when the gas flows in the pump case. Only when
the pump is operated under no load or at stop.
Oil return mechanism B
Oil returns into the pump compression process through the gas ballast port.
CAUTION: Oil return mechanism B shall cause to rise the ultimate pressure. The gas ballast
cannot be performed unless the oil is completely recovered since using the gas
ballast port. On the other hand, the ability of oil returns is reduced because the pump
compression process time is increased for the operation under the high pressure.
Oil return mechanism C
Oil returns into the inlet port.
CAUTION: At the oil recovery, Oil return mechanism C causes to rise the ultimate pressure
because the same as a leak at the inlet port.