KIMAIR KOE Series Oil-free Rotary Screw Air Compressors

The KOE series is KIMAIR’s dry oil-free screw air solution for industries with stringent air quality requirements. Featuring a completely oil-free design, precision synchronous gear transmission, and specialized dry sealing technology, the KOE series ensures 100% oil-free compressed air, meeting the highest ISO 8573-1 Class 0 (2010) standard. It is a trusted power source for industries such as Food & Beverage, Pharmaceutical, and Electronics & Semiconductor.

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Oil-free Rotary Screw Air Compressors

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Video Tutorial

KIMAIR KOE Series Oil-free Rotary Screw Air Compressors Principle Explanation Video

KIMAIR Core Advantages

100% Oil-Free Pure Air

Absolute Oil-Free Design: The compression chamber is completely isolated from the gearbox using non-contact dry seals, fundamentally eliminating oil contamination.
Class 0 Certified: Each unit undergoes rigorous testing before delivery, ensuring zero oil carryover and compliance with the strictest international oil-free standards.
High-Quality Air Treatment Integration: When paired with KIMAIR heatless or heated blower purge adsorption dryers (KDH/KDHL), the system can provide extremely dry pure air with a pressure dew point as low as -70°C.
High-Efficiency Airend Technology

High-Efficiency Dry Screw Airend: Features specially coated asymmetric rotors with high meshing precision and low internal leakage, achieving industry-leading volumetric efficiency.
Precision Synchronous Gear Transmission: Uses aviation-grade high-precision timing gears to ensure synchronous rotor operation, smooth performance, and long service life.
Intelligent Temperature Control: A multi-stage temperature control system ensures the airend and bearings operate within an optimal temperature range, preventing thermal deformation and ensuring long-term stability.
Low Maintenance & High Reliability

Simplified Oil-Free System: Eliminates complex oil circuits, oil separators, and oil cooling systems, significantly reducing potential failure points and simplifying maintenance.
Long-Life Key Components: Bearings and seals are made from special materials with extended design life, with core components designed to last over 80,000 hours.:
Modular Design: Independent layout of key functional modules prevents interference during maintenance, greatly reducing downtime.

Technical Specifications

Model	Motor Power		Free air delivery（m³/min）			Outlet	Weight （kg）	Dimensions （mm）
Model	（kW）	（Hp）	0.75MPa	0.85MPa	1MPa	Outlet	Weight （kg）	Dimensions （mm）
KOE75	55	75	9.1	8.0	7.5	DN65	3100	235016501950
KOE100	75	100	11.8	11.2	10.8	DN65	3200	235016501950
KOE120	90	120	14.5	13.5	12.8	DN65	3350	235016501950
KOE150	110	150	19.0	17.1	/	DN80	3700	310018002300
KOE180	132	180	22.2	20.2	/	DN80	3750	310018002300
KOE200	145	200	23.6	21.8	/	DN80	3800	310018002300
KOE220	160	220	28.2	26.3	24.2	DN80	5300	350020002300
KOE270	200	270	36.4	33.5	30.5	DN80	5380	350020002300
KOE340	250	340	43.5	41.5	38.5	DN80	5450	350020002300
KOE420	315	420	50.8	50.6	/	DN80	5800	350020002300
KOE150W	110	150	19.1	17.2	15.9	DN80	2638	270016502000
KOE180W	132	180	22.4	20.2	18.8	DN80	2760	270016502000
KOE200W	145	200	23.8	21.9	20.5	DN80	3260	270016502000
KOE220W	160	220	28.3	26.4	24.4	DN80	4850	320018002170
KOE270W	200	270	36.5	34.2	30.5	DN80	4950	320018002170
KOE340W	250	340	43.8	41.5	38.5	DN80	5100	320018002170
KOE420W	315	420	50.8	50.6	/	DN80	5500	320018002170

Application Scenarios

The KOE series is essential for industries with zero tolerance for air quality compromise:

- Food & Beverage: Direct product contact blowing, filling, and packaging to ensure food safety.
- Pharmaceutical & Biotech: API production, fermentation, sterile packaging – compliant with GMP standards.
- Electronics & Semiconductor: Chip manufacturing, PCB cleaning, precision electronics assembly to prevent short circuits or oxidation caused by oil.
- Medical & Laboratory: Breathing air, instrument air, lab gas supply for safety and precision.
- Chemical & Painting/Coating: Oil-sensitive chemical reactions, high-end automotive and furniture painting to ensure pure, flawless finishes.

Customer Frequently Asked Questions (FAQ)

Q: Which is better – a dry oil-free compressor or an oil-flooded compressor with oil removal filters?

A: There is a fundamental difference. Filters have saturation and failure risks, cannot guarantee 100% oil-free safety, and incur high maintenance costs and pressure drop. A dry oil-free compressor eliminates oil contamination at the source, offering the highest reliability and often a lower Total Cost of Ownership (TCO) for high-quality air demand scenarios.

Q: Is the maintenance cost high for the KOE series oil-free rotary screw air compressor? What does maintenance mainly involve?

A: Routine maintenance primarily involves changing air filters and checking gearbox oil (completely isolated from the compression chamber). Without an oil system, the routine maintenance cost and complexity are typically lower than oil-flooded units. Major costs involve periodic timing gear inspections and dry seal replacements, but these intervals are very long (typically tens of thousands of hours).

Q: Is the discharge temperature of a dry oil-free compressor very high?

A: Since there is no oil for cooling, the discharge temperature is indeed higher than oil-flooded units. However, the KOE series uses efficient intercooling, optimized rotor design, and precise temperature monitoring to keep discharge temperatures within a safe range (typically ≤ Ambient +15°C), ensuring normal operation of downstream air treatment equipment like dryers.

Q: How do you guarantee 100% oil-free air?

A: KIMAIR ensures this through physical isolation in design, a dedicated oil-free assembly environment, and rigorous oil content testing (typically below 0.001 mg/m³) using professional instruments before each unit leaves the factory. We provide an official Class 0 inspection report.

Why choose the KIMAIR KOE series?

- Absolute Purity Assurance: Provides the most reliable oil-free air solution with Class 0 certification and source-level oil-free design.
- Outstanding Operating Efficiency: High-efficiency dry airend technology and precise transmission deliver excellent energy efficiency even under oil-free conditions.
- Global Industry Experience: Our products are widely used in high-end manufacturing worldwide, giving us deep insight into strict pure air requirements across industries.
- Complete Support System: We provide full-process professional services from selection, installation, and validation to maintenance, ensuring your system operates at peak condition.

Get Your KIMAIR Compressed Air Solution

- [Download KOE Series Class 0 Certification Report & Technical Manual]
- [Get White Paper on Oil-Free Compressed Air Solutions for Food/Pharma Industries]
- [Schedule a Professional Engineer to Assess Your Oil-Free Air Needs]
- [View KOE Application Case Study at a Leading Pharmaceutical Company]

Oil-free Rotary Screw Air Compressors provide clean, contaminant-free compressed air for industries where air quality is critical. Designed without oil in the compression chamber, they help eliminate contamination risks while ensuring efficient and reliable operation. Widely used in food processing, pharmaceuticals, electronics, healthcare, and laboratory applications, these compressors deliver stable airflow, low maintenance requirements, and energy-efficient performance. Their durable design supports continuous operation, helping businesses maintain product quality, improve productivity, and reduce operating costs.