A high-pressure oil-free screw air compressor delivers compressed air at 20-40 bar with zero oil carryover, meeting ISO 8573-1 Class 0 purity. It is the standard air source for PET bottle blowing, cosmetic container molding, pharmaceutical infusion packaging, and any process where compressed air directly contacts the end product. RAYDAFON RD-HP series uses a two-stage dual-drive design with dual permanent-magnet variable-frequency motors, delivering 20-40 bar oil-free air with automatic flow matching from 40% to 100% frequency.
Single-stage screw compressors typically reach only 10-15 bar efficiently. The RD-HP series uses two compression stages in series, connected by water-vapor separation barrels, to reach 20-40 bar with low discharge temperature and high efficiency.
Ambient air enters the first-stage air end through the intake filter and is compressed to 5-7 bar. The stage-1 water-vapor separation barrel removes condensate and heat. The air then enters the second-stage air end for further compression to 20-40 bar, followed by a second separation barrel and post-treatment. The motor directly drives the air end at up to 3,000 RPM, with speed automatically adjusted through the frequency converter (40-100% range) to match air demand and reduce energy consumption.
Traditional piston-type high-pressure oil-free compressors create recurring problems that impact both operations and compliance. The RD-HP series addresses each pain point directly.
| Parameter | Specification |
|---|---|
| Working Pressure | 20-40 bar (290-580 psi) |
| Oil Content | 0 ppm (ISO 8573-1 Class 0) |
| Compression Type | Two-stage dual-drive screw |
| Drive Method | Dual permanent-magnet variable-frequency motors |
| Motor Efficiency | 97% |
| Speed Range | Up to 3,000 RPM; frequency 40-100% |
| Wetted Material | 304 food-grade stainless steel |
| Maintenance | Air filter + water filter only |
| Certifications | TÜV Oil-Free, CE, ISO 9001 |
High-pressure oil-free air is required wherever compressed air contacts the end product or must remain absolutely oil-free under high pressure. The most demanding applications share three requirements: 20-40 bar pressure, 0 ppm oil content, and Class 0 purity.
Each design feature of the RD-HP series targets a specific requirement of high-pressure oil-free operation: efficiency at elevated pressure, zero contamination, and low maintenance cost over the compressor's full service life.
Independent motors on each stage allow the compressor to maintain high efficiency across the 20-40 bar range without over-compressing. The dual-drive design avoids the energy losses of single-motor staged compression.
Two permanent-magnet motors with independent inverters deliver 97% efficiency. Frequency adjusts between 40% and 100% to match actual air consumption, eliminating the unload losses of fixed-speed compressors and lowering total energy consumption.
The screw-type compression chamber has significantly fewer moving parts than a piston compressor. Maintenance is limited to air filter and water filter replacement, cutting maintenance costs by 50-80% compared to piston-type high-pressure units.
Screw compression produces smooth, pulse-free air output. This eliminates the pulsation that can affect PET blow molding consistency, and reduces noise to levels suitable for indoor installation near production lines.
All parts in contact with compressed air are made of food-grade 304 stainless steel. Rotors are water-lubricated, ensuring the compressed air remains absolutely clean and free of oil, bacteria, or metallic particles.
| Application | Recommended Pressure | Key Requirement |
|---|---|---|
| Beverage PET bottle blowing | 25-35 bar | Class 0 air + stable pressure |
| Cosmetic container molding | 20-30 bar | No oil contamination |
| Pharmaceutical infusion packaging | 25-40 bar | FDA compliant + Class 0 |
| Laser cutting assist gas | 20-30 bar | High-purity, oil-free |
| General high-pressure oil-free | 20-40 bar | ISO 8573-1 Class 0 |
Pricing depends on working pressure, flow capacity, motor configuration, and material selection. Share your application parameters and RAYDAFON will respond with a factory-direct quote and an energy-saving report within 12 hours.
For a complete high-pressure oil-free compressed air system, pair your RD-HP compressor with:
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