100% Oil-Free Rotary Screw Compressors Fixed & Regulated Speed (RS)
Welcome to the new DX series range of oil-free air compressor from CompAir, with 8 new models available as both fixed and regulated speed versions in the large 200 - 355 kW range, pressure range: 4 to 10 bar, volume flow 11.4 to 53.4 m³/min
Oil-free rotary screw compressors are industrial compressed-air machines designed to deliver air that contains no oil contamination whatsoever — suitable for industries where air purity is critical (e.g., food & beverage, pharma, electronics). The “100% oil-free” label means the compressor’s internal compression elements don’t use oil for lubrication, sealing, or cooling, and the delivered air meets ISO 8573-1 Class 0 air quality standards (strictest purity level).
These machines typically come in two control versions:
Fixed Speed: Traditional constant-speed operation — simple and reliable.
Regulated Speed (RS): Variable speed control that adapts motor speed to actual air demand, increasing energy efficiency and reducing running costs.
🔧 How They Work
🌀 Rotary Screw Principle
A pair of interlocking rotors compress air as they turn inside a housing.
In oil-free versions, materials and coatings (or water injection in some designs) ensure lubrication and sealing without oil contact.
⚙️ Fixed vs. Regulated Speed
Fixed Speed: Runs at full speed whenever it’s on; good for steady demand.
Regulated Speed (RS): Uses a variable frequency drive (VFD) to adjust motor speed based on demand — saves energy and reduces pressure fluctuations.
✅ Key Benefits
🌟 100% Oil-Free Air
Pure compressed air with no oil or oil vapor — ideal for strict hygiene and quality environments (e.g., pharmaceuticals and food processing).
💸 Energy Efficiency
RS models significantly reduce energy use by matching compressor output to actual demand (can save 20–30%+ vs fixed speed).
⚙️ Wide Pressure & Flow Options
Compressors can cover a broad range (from ~37 kW up to ~355 kW motor sizes) with pressures typically from ~4 to 10 bar and flow up to tens of m³/min.
🏭 Reliable in Demanding Applications
When PureAir Technology is High Priority
There’s a lot riding on the quality of your air. The presence of particles, condensate, oil and oil vapor in a compressed air system can lead to downtime, product spoilage and recall, damage to your brand reputation, or worse, harmed consumers and product liability.
Built for heavy industrial use with robust components, corrosion protection, remote monitoring (iConn), and service programs to ensure uptime.
