Oil Free Air Compressors: Best Choice for Pure Air
Two Stage Oil-Free Rotary Screw Compressors
Fixed and regulated speed rotary screw air compressors
The launch of this brand-new range of oil-free screw compressors offers the lowest total cost of ownership on the market, with up to 8% higher flow rates, up to 7% energy reduction and guaranteed air purity. These high output oil-free machines now cover a wide flow range from 14.6 to 28.3 m³/min. The DX90 to DX160 models are fixed speed and the DX90RS to DX160RS models are regulated speed.
Pressure range: 4 to 10.7 bar
Volume flow: Capacity of 6.7 to 28.3 m³/min
Motor power: 90 to 160 kW
CompAir has extended its proven range of DX, oil-free rotary screw air compressors with the launch of the new DX90-160 (RS) series, offering up to 14 per cent improvement in energy efficiency and up to eight per cent higher flow compared to industry standards. The range has been designed to offer best-in-class energy performance, excellent reliability and reduced lifecycle costs - in an oil-free compressor which is Class Zero certified according to ISO 8573-1:2010. This means there is virtually no risk of contamination in the production process, making it ideal for applications where high levels of air purity are essential. The new range includes fixed and variable-speed models from 90 to 160 kW.
David Bruchof, Oil-Free Product Manager, said: “Capable of delivering pressure ranges from 4 to 10.7 bar and volume flow between 6.7 to 28.3 m³/min, our new series is the latest enhancement to our proven range of two-stage, oil-free rotary compressors and has been designed to prioritise efficiency at every stage. From the completely redesigned air end to the unparalleled energy efficiency improvements of the whole compressor package, this new series will deliver substantial energy savings, with the lowest cost of ownership for rapid return on investment.”
Oil-free air compressors are widely considered the best choice when air purity, hygiene, and contamination-free processes are critical. Industries like pharmaceuticals, food processing, electronics, and healthcare rely on them because they deliver 100% oil-free compressed air without the risk of oil carryover.
Below is a clear breakdown of oil-free systems, especially two-stage rotary screw compressors and fixed/regulated speed models, along with real product examples.
100% pure air (ISO Class 0) → no oil contamination risk
Lower maintenance → no oil changes or disposal
Environment-friendly → no condensate treatment needed
Critical for sensitive industries (food, pharma, electronics)
Why it stands out:
Two-stage compression improves efficiency and pressure output
Suitable for heavy-duty industrial operations
Designed for continuous operation with pure air delivery
👉 Two-stage systems compress air in multiple steps, achieving higher pressures and efficiency than single-stage models.
🔷 Small / Workshop Oil-Free Compressors
For lighter applications (garages, labs, dental, small workshops):
HYCO Industrial Oil Free Air Compressor – medium-duty with tank
Elephant 2 HP Oil Free Air Compressor – noiseless workshop unit
Btali 9L Oil Free Compressor – portable, compact
🔷 Fixed vs Regulated (Variable) Speed – Key Difference
Fixed Speed Compressors
Run at constant RPM
Best for steady air demand
Lower upfront cost
Variable Speed (VSD) Compressors
Adjust speed based on demand
Energy-efficient and reduces power waste
Ideal for fluctuating workloads
🔷 Final Takeaway
If air purity is non-negotiable, go for a two-stage oil-free rotary screw compressor—it offers the best combination of clean air, efficiency, and reliability.
Choose two-stage oil-free → for critical industries
Choose fixed speed → for constant usage
Choose variable speed (VSD) → for energy savings and variable demand
