The air-oil separator filter is one of the important spare parts of oil-flooded screw air compressors. Its function is to separate oil from the compressed air-oil mixture after compression, reducing oil carryover in the discharged air and returning the oil to the system for continued circulation.
A good-quality oil separator, selected with the correct specifications and matched to the compressor model, helps reduce oil consumption, maintain compressed air quality, stabilize pressure, and lower operating costs.
How the Oil Separator Works
In oil-flooded screw air compressors, oil is injected into the compression chamber to provide lubrication, cooling, and sealing between the two rotors.
After compression, the air-oil mixture is fed into the separator tank, where most of the oil is separated in a first stage. The remaining oil mist in the compressed air then passes through the oil separator element.
The filter media captures and coalesces small oil droplets into larger ones. The recovered oil is returned to the system, while the compressed air continues to the discharge line for use.
Functions of the Oil Separator Filter
The oil separator plays several important roles:
- Separates oil from the compressed air stream after the airend.
- Reduces oil carryover into the piping system.
- Reduces oil consumption during operation.
- Helps maintain the quality of the discharged compressed air.
- Protects the air dryer, line filters, and downstream equipment.
- Helps maintain the operating performance of the air compressor.
- Reduces oil top-up and system maintenance costs.