Oil control
Why?
– Keep optimal oil temperature and pressure
in order to guarantee reliable compressor
operation.
How?
– Pressure: maintain and control the pressure
differential across the compressor for oil
circulation, maintain the crankcase pressure
(only for piston compressors);
– Temperature: bypass some oil **around the oil
cooler; control the cooling air or water to the
oil cooler;

Возникло сомнение касательно предлога around.

Спасибо.