As the amount of oil collecting at the bottom increases, the float rises. When the float rises to a point where the oil is higher than the valve of the return line, the float valve opens.
Oil is forced through the return line because the discharge pressure in the separator is greater than the suction pressure in the oil return line.
The float continues to rise and fall, opening and closing the valve, as oil collects and is pumped back to the compressor.
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