oil free air compressors

The FS Curtis EX Series Oil-Free Screw Air Compressors are high-capacity, Class 0 certified compressed air systems engineered for mission-critical industrial applications requiring absolute air purity and maximum energy efficiency. Available in the 100 – 370 HP range, the EX platform utilizes advanced dry oil-free screw compression technology with precision-timed rotors and non-contact compression chambers. The airend incorporates high-strength alloy steel rotors with specialized anti-corrosion coatings ensuring durability under high temperature and humidity conditions. Timing gears synchronize rotor motion without lubrication contact, maintaining 100% oil-free air delivery. Two-stage compression with intercooling significantly improves volumetric efficiency and reduces specific power consumption by up to 3–4% compared to conventional designs. Independent auxiliary oil pumps lubricate bearings and timing gears while remaining isolated from the compression chamber. Integrated low-pressure drop coolers, stainless steel piping, and centrifugal cooling fans ensure superior thermal management. The 3-box modular cooling structure separates airend, motor, and cooling airflow zones for optimized heat dissipation. Advanced electronic controllers provide real-time monitoring, load/unload optimization, condensate auto-drain systems, and predictive diagnostics. Optional VSD control further enhances part-load efficiency. Sound-attenuated enclosures with vibration-isolated mounts reduce operational noise by 4–7 dB. These compressors are ideal for pharmaceuticals, semiconductors, food & beverage, electronics, textiles, petrochemicals, and instrumentation air systems.

The FS Curtis ER Series Oil-Free Screw Air Compressors are water-injected rotary screw systems engineered to deliver 100% oil-free compressed air for critical process applications. Available from 15 to 120 kW, the ER platform utilizes advanced water-injection compression technology to achieve near-isothermal compression, resulting in superior efficiency and reduced discharge temperatures. During operation, injected water performs dual functions as a sealant and coolant. It reduces internal leakage between rotors and housing while absorbing heat of compression, improving volumetric efficiency by up to 15% compared to dry oil-free designs. The compression chamber operates at significantly lower temperatures, enhancing airend longevity and reliability. The airend incorporates precision male–female rotor profiles, timing gears, water seals, and shaft seals to maintain oil-free air purity. Bearings are splash-lubricated for durability while remaining isolated from the compression chamber to prevent contamination. Direct-coupled drive transmission ensures minimal mechanical losses. Integrated inverter control maintains constant discharge pressure with ±0.1 bar stability while reducing starting current and improving energy performance. VSD operation enables linear output modulation from 20–100% load demand. Advanced filtration systems ensure injected water purity, preventing corrosion and scaling within the compression chamber. eCOOL™ airflow management and enclosure insulation deliver low noise operation and extended component life. These compressors are ideal for pharmaceuticals, food & beverage, electronics, textiles, petrochemicals, medical air, instrumentation air, and powder conveying applications requiring Class 0 oil-free air quality.