KDOF Series 100% Oil Free Dry Screw Air Compressor | ISO 8573-1 Class0
The KDOF Series two-stage oil-free dry screw air compressor delivers 100% pure, oil-free compressed air. Built around German GHH airend, optimized two-stage compression provides stable high purity air for food, pharmaceutical, electronics and other critical industries where zero contamination and long-term efficiency are non-negotiable.
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Functional Configuration
- German GHH airend
- Two-stage dry screw compression airend
- TEFC Motor
- IP54/IP55, Class F insulation
- Ultra-Coat Rotor
- 300°C temperature resistant coating
- Siemens Control System
- 30-language full text HMI monitor
- Air & Water Cooling
- Air-cooled / Water-cooled optional
- VSD & Fixed Speed
- Variable Speed & Fixed speed models
- Wide Maintenance Door
- Swing-out cooler for easy service
- High-efficiency cooling jacket
- Direct interlayer airend cooling
Performance Parameters
- Working pressure range
- 7–11 bar (101.5–159.5 psi)
- Air delivery
- 7.98–58.44 m³/min (281.8–2063.8 CFM)
- Power range
- 37–355 kW (49.6–476.1 hp)
- Air purity
- ISO 8573-1 Class 0 100% Oil-Free
- Rotor material
- Chromium Stainless Steel
- Max rotor coating temp
- 300°C
- Certification
- CE, ISO, ASME
Why KDOF Series Wins Industrial Procurement
What Industrial Buyers Usually Worry About
- Risk of product contamination from oil carryover in sensitive production lines.
- High downtime & expensive maintenance on large oil-free compressor systems.
- Corrosion and rotor jamming problems under long-time continuous operation.
- Poor heat dissipation causing efficiency drop and frequent overheating shutdown.
- Difficulty finding oil-free compressors that meet CE/ISO/ASME global standards.
- High energy consumption under fluctuating compressed air demand.
How KDOF Series Reduces Procurement & Operation Risks
- ISO 8573-1 Class0 certified oil-free compression completely removes oil contamination risk.
- German GHH airend with stainless steel rotors prevents corrosion & rotor seizure.
- Ultra-Coat rotor coating withstands up to 300°C for years of stable sealing & protection.
- Direct airend casing interlayer cooling design delivers excellent heat dissipation.
- CE/ISO/ASME certified unit meets international hygiene & safety requirements.
- VSD variable speed model automatically adjusts airflow to match demand and save power.
- Humanized design with swing-out cooler and wide access door to cut maintenance time.
Recommended Applications
ISO 8753 Class 0 certificated:
100% Oil-free dry screw compressor produces no pollution, ensuring the purity of compressed air and safeguard your product.
Long-term high efficiency:
Kotech two-stage oil free dry screw air compressor is durable and ensures a long-term and stable compressed air production because of its optimized two stage compression design.
The Kotech two stage rotary screw air compressor have maximum efficiency and performance that can be driven up to 500kw. So it can even meet the volatile compressed air demand requirements.
Chromium Steel Rotors:
The rotors of the two-stage compression are made from stainless steel, which eliminates the risk of rotor seizing or jamming caused by corrosion.
Durable Coating:
The blasted rotors are treated using the special “Ultra-Coat” process to produce an innovative and durable coating which is resistant to temperatures of up to 300°C, because this cost-reducing coating is highly abrasion-resistant, its sealing and protection performance remains consistent even after years of operation.
High efficient air end cooling:
In areas that require cooling, the coolant directly passes through the inter layer of the air-end’s casing, taking away high temperature heat to ensure good heat dissipation and maintain good compression efficiency.
Complete unit:
Oil-free dry rotary screw compressor with two-stage compression; condensate separator, condensate drain and fibre-free pulse dampers for both compression stages; oil tank ventilation with micro-filter, ready for operation, fully automatic and silenced.
Friendly Service:
The oil-free air compressor is designed with a wide maintenance door and a swing-out cooler, which make maintenance so easy.
Siemens control system:
Full-text display, 30 languages available;soft touch icon keys; “traffic light” style, LED to indicate operating status; fully automatic monitoring and control.
Ventilation system:
Powerful ventilation and cold box design gives it excellent heat dissipation effect, ensures the low temperature inside the compressor unit.
The main advantages of 100% Oil Free Dry Screw Air Compressor are:
- Adopt oil free GHH air end made in Germany.
- It offers efficient compression with low operational noise, long service life and no air pollution since there is no oil involved.
- Low maintenance costs, as minimal care and maintenance is needed, resulting in lower running costs.
- Oil free screw compressor has various applications in industrial purposes, such as food and beverage, medical, electronics and many more.
- It is compact in design and can fit into any tight spaces.
- It provides a clean and dry compressed air, ideal for sensitive and critical applications.
Frequently Asked Questions
Yes. KDOF compressors are ISO 8573‑1 Class 0 certified with zero oil in the compression chamber, eliminating contamination risks for critical processes.
Perfect for food & beverage, pharmaceutical, medical, electronics, bottling, wastewater treatment, flue gas desulfurization, and cleanroom applications requiring ultra‑pure air.
Power: 37–355kW; Working pressure: 7–11bar; Capacity: 7.98–58.44m³/min; Cooling: air‑cooled & water‑cooled; Drive: fixed speed & VSD available.
Two‑stage compression provides higher efficiency, lower discharge temperature, better stability, and longer service life, especially under high‑pressure and heavy‑duty conditions.
Minimal maintenance: no oil changes, no oil separators. Only routine checks of filters, drains, and cooling system. Wide service doors & swing‑out cooler simplify upkeep.
Yes. We offer VSD models that automatically adjust airflow to match fluctuating demand, saving energy and reducing total operating cost.
KDOF Series Quick Selection Table
| Model | Discharge Pressure (Mpa) | Working Pressure (bar) | Discharge Air Volume (m³/min) | Motor Power (kw) | Voltage and IP Grade | Noise | Discharge Pipc.Dia | Dimension(mm)-L | Dimension(mm)-W | Dimension(mm)-H | Weight-Kg |
|---|---|---|---|---|---|---|---|---|---|---|---|
| KDOF37W | 0.7 / 0.85 | 7 / 8.5 | 6.0 / 5.1 | 37 | 380V IP54 | 80±3 | G1-1/2 | 2247 | 1371 | 1916 | 2387 |
| KDOF45W | 0.7 / 0.85 | 7 / 8.5 | 7.7 / 6.5 | 45 | 380V IP54 | 80±3 | G1-1/2 | 2247 | 1371 | 1916 | 2497 |
| KDOF55W | 0.75 / 0.85 / 1.05 | 7.5 / 8.5 / 10.5 | 9.15 / 9.11 / 7.98 | 55 | 380V IP54 | 80±3 | G1-1/2 | 2100 | 1500 | 1790 | 2600 |
| KDOF75W | 0.75 / 0.85 / 1.05 | 7.5 / 8.5 / 10.5 | 12.51 / 11.60 / 10.81 | 75 | 380V IP54 | 80±3 | DN50 | 2300 | 1600 | 1790 | 2800 |
| KDOF90W | 0.75 / 0.85 / 1.05 | 7.5 / 8.5 / 10.5 | 13.39 / 13.37 / 12.41 | 90 | 380V IP54 | 80±3 | DN50 | 2300 | 1600 | 1790 | 3400 |
| KDOF110W | 0.75 / 0.85 / 1.05 | 7.5 / 8.5 / 10.5 | 19.96 / 18.74 / 16.40 | 110 | 380V IP54 | 82±3 | DN65 | 2800 | 1800 | 1860 | 3400 |
| KDOF132W | 0.75 / 0.85 / 1.05 | 7.5 / 8.5 / 10.5 | 23.58 / 22.13 / 19.89 | 132 | 380V IP54 | 82±3 | DN65 | 2800 | 1800 | 1860 | 3450 |
| KDOF160W | 0.75 / 0.85 / 1.05 | 7.5 / 8.5 / 10.5 | 26.85 / 25.47 / 23.51 | 160 | 380V IP54 | 82±3 | DN65 | 2800 | 1800 | 1860 | 3550 |
| KDOF185W | 0.75 / 0.85 / 1.05 | 7.5 / 8.5 / 10.5 | 29.73 / 29.65 / 26.79 | 185 | 380V IP54 | 82±3 | DN65 | 2800 | 1800 | 1860 | 3950 |
| KDOF200W | 0.75 / 0.85 / 1.05 | 7.5 / 8.5 / 10.5 | 33.49 / 33.35 / 29.89 | 200 | 380V IP54 | 85±3 | DN100 | 3100 | 2150 | 2200 | 4500 |
| KDOF220W | 0.75 / 0.85 / 1.05 | 7.5 / 8.5 / 10.5 | 35.97 / 35.92 / 33.28 | 220 | 380V IP54 | 85±3 | DN100 | 3100 | 2150 | 2200 | 5000 |
| KDOF250W | 0.75 / 0.85 / 1.05 | 7.5 / 8.5 / 10.5 | 42.85 / 42.66 / 38.30 | 250 | 380V IP54 | 85±3 | DN100 | 3100 | 2150 | 2200 | 5200 |
| KDOF280W | 0.75 / 0.85 / 1.05 | 7.5 / 8.5 / 10.5 | 46.73 / 45.64 / 42.61 | 280 | 380V IP54 | 85±3 | DN100 | 3400 | 2400 | 2200 | 6400 |
| KDOF315W | 0.75 / 0.85 / 1.05 | 7.5 / 8.5 / 10.5 | 51.41 / 51.25 / 46.47 | 315 | 380V IP54 | 90±3 | DN100 | 3400 | 2400 | 2200 | 6400 |
| KDOF355W | 0.75 / 0.85 / 1.05 | 7.5 / 8.5 / 10.5 | 58.44 / 57.89 / 50.99 | 355 | 380V IP54 | 90±3 | DN100 | 3400 | 2400 | 2200 | 6400 |
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Frequently Asked Questions
Yes. KDOF compressors are ISO 8573‑1 Class 0 certified with zero oil in the compression chamber, eliminating contamination risks for critical processes.
Perfect for food & beverage, pharmaceutical, medical, electronics, bottling, wastewater treatment, flue gas desulfurization, and cleanroom applications requiring ultra‑pure air.
Power: 37–355kW; Working pressure: 7–11bar; Capacity: 7.98–58.44m³/min; Cooling: air‑cooled & water‑cooled; Drive: fixed speed & VSD available.
Two‑stage compression provides higher efficiency, lower discharge temperature, better stability, and longer service life, especially under high‑pressure and heavy‑duty conditions.
Minimal maintenance: no oil changes, no oil separators. Only routine checks of filters, drains, and cooling system. Wide service doors & swing‑out cooler simplify upkeep.
Yes. We offer VSD models that automatically adjust airflow to match fluctuating demand, saving energy and reducing total operating cost.
