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Why Choose Our 55kW Dry Oil-Free Screw Compressor?
Our dry oil-free screw air compressor delivers 100% oil-free compressed air certified to ISO 8573-1 Class 0 – the highest international standard for air purity. The compression chamber uses absolutely no lubricating oil during operation, ensuring zero risk of oil contamination in your production process.
Core Advantages
100% Oil-Free Air (Class 0 Certified)
The compression chamber operates completely dry – no oil is introduced into the air stream. Complies with ISO 8573-1 Class 0 standards, with oil content below 0.01 mg/m³. Ideal for applications where even trace oil contamination is unacceptable.
Two-Stage Compression for Higher Efficiency
Two-stage compression design delivers 5–10% higher efficiency compared to single-stage units. Lower discharge temperatures per stage improve reliability and extend component life.
Special Coated Rotors for Durability
Rotors and housing interiors feature advanced coatings (e.g., MoS₂ thermal-curing coating) that provide exceptional surface adhesion, corrosion resistance, and high-temperature tolerance – ensuring long-term protection and minimal friction.
Low Noise & Vibration
Engineered with sound-attenuating enclosures and anti-vibration mounts. Noise levels are significantly lower than conventional units, making them suitable for indoor installation adjacent to production areas.
Intelligent Control System
Equipped with advanced PLC controllers featuring real-time monitoring, automatic fault diagnosis, and remote connectivity. Touchscreen HMI enables simple operation and data tracking.
Low Maintenance Costs
No oil separators to replace; no oil filtration system to maintain. Fewer wearing parts translate to significantly lower routine maintenance costs compared to oil-injected counterparts.
Energy Efficient
Advanced control logic optimizes pressure and flow to match actual demand, reducing unnecessary energy consumption. With energy accounting for over 70% of a compressor's lifecycle cost, this translates to substantial long-term savings.
| Dry Oil-free Screw Air Compressor RDO Series | ||||||||||
| Model | Air Delivery (m3/min) | Power (kW) | Noise dB(A) | Outlet diameter | Dimension (mm) | Weight (Kg) | ||||
| 7bar | 8bar | 10bar | Air-cooled | Water-cooled | Air-cooled | Water-cooled | ||||
| RDO-55A/W | 5.7-9.8 | 5.2-9.0 | 4.4-7.8 | 55 | 69±3 | DN50 | 2200*1400*2000 | 2200*1500*1720 | 2850 | 2900 |
Dry Oil-Free vs. Oil-Injected Screw Compressors
| Feature | Dry Oil-Free Screw Compressor | Oil-Injected Screw Compressor |
| Compression Chamber | Completely dry – no oil used in compression | Oil is injected for lubrication, cooling, and sealing |
| Air Purity | ISO 8573-1 Class 0 – oil content <0.01 mg/m³ | Requires downstream filtration; typically Class |
| Key Components | No oil separator, no oil sump, no minimum pressure valve | Oil separator, oil sump, minimum pressure valve required |
| Cooling System | Independent inter-stage coolers + moisture separators | Oil serves as primary coolant |
| Air End Coating | Special anti-friction, high-temperature coatings on rotors | Standard rotor coatings (oil provides lubrication) |
| Synchronous Gears | Requires timing gears to synchronize rotors | No timing gears – oil film drives the female rotor |
| Maintenance | No oil changes, no oil filter replacements – lower long-term cost | Regular oil changes, oil filter and separator replacements |
| Service Life | Typically 10+ years | Typically ~5 years |
| Initial Cost | Higher upfront investment | Lower initial cost |
| Operating Cost | Lower overall (no oil-related consumables) | Higher (oil, filters, separators, disposal) |
| Applications | Food, pharma, electronics, medical, precision coating | General industrial, construction, workshop air |
Application Industries
Food & Beverage: Filling, packaging, fermentation, bottle blowing, product conveying – prevents oil taint and meets HACCP/FDA requirements.
Pharmaceutical & Biotech: Tableting, capsule filling, lyophilization, cleanroom air supply – meets GMP standards.
Electronics & Semiconductors: Wafer cleaning, photolithography, etching, PCB assembly – prevents oil particles from causing circuit defects.
Medical & Healthcare: Hospital air supply, ventilators, dental equipment – meets ISO 7396-1 medical gas standards.
Precision Coating & Painting: Automotive topcoats, optical lenses, LCD panels – oil-free air prevents surface defects.
Chemical & Laboratory: Catalyst-sensitive reactions, GC/MS and other analytical instruments – prevents oil vapor interference.
New Energy (Batteries): Lithium battery filling, drying, stacking – oil contamination can cause short circuits or thermal runaway.
Textile: Air-jet looms, spinning – prevents oil stains on finished products.
Customer Visits
We welcome clients to visit our factory to see our production processes, quality control, and team in action.
FAQ
Q1: What does "Class 0" mean?
Class 0 means oil content below 0.01 mg/m³ – the highest purity standard per ISO 8573-1. Our compressor delivers that.
Q2: Is it completely oil-free?
The compression chamber is dry – no oil in the air stream. Bearings and gears are lubricated separately but fully sealed to prevent any oil ingress.
Q3: How efficient is it vs. oil‑injected units?
Two‑stage dry designs avoid over‑compression losses, making them more efficient. Advanced controls match output to demand, saving energy.
Q4: What maintenance is needed?
No oil changes or filter replacements. Just check air filters (every 500 hours), monitor temperatures, inspect seals, and grease bearings per manual.
Q5: Can it run 24/7?
Yes – built for heavy‑duty continuous operation with robust motors and cooling.
Q6: Why is it pricier than oil‑injected?
Higher precision parts, coated rotors, timing gears, and complex cooling. But long‑term maintenance is lower, and you avoid costly product contamination.
Q7: What certifications?
ISO 8573-1 Class 0, CE, ISO 9001:2015. ASME available on request.
Q8: Can pressure/flow be customized?
Yes – standard range 0.7–1.0 MPa (7–10 bar), flow adjustable to your needs.
Q9: What is the service life?
10+ years with proper care – compared to ~5 years for oil‑injected units.
Q10: Best industries for this?
Any where oil contamination is critical: food, pharma, electronics, medical, precision coating, and chemicals.
