KOF-30A Oil-Free Screw Compressor

When the cost of air contamination is measured in product recalls, patient safety, or nanometer-scale defects, there is no margin for compromise. The KOF-30A Oil-Free Screw Compressor delivers ISO 8573-1 Class 0 certified air at higher flow rates than spiral technology, making it the standard choice for pharmaceutical cleanrooms, hospital central air systems, and industrial processes where absolute purity is a regulatory requirement.

Core Performance Specifications

Oil-Free Screw Element Technology

The heart of the KOF-30A is a precision-machined twin-screw compression element with asymmetric rotor profiles. Unlike oil-injected screw compressors where oil serves as a sealing and cooling medium, the KOF-30A's screw rotors operate with tight clearances that eliminate the need for any liquid in the compression chamber. Air is compressed purely through the mechanical meshing of the rotors, ensuring zero oil contact from intake to discharge.

Water-injected cooling replaces the traditional oil-based thermal management system. Purified water is injected into the compression chamber in micro-droplet form, absorbing compression heat without introducing any contaminants. The water is then separated from the compressed air via centrifugal separation and recirculated through a closed-loop cooling system — no water consumption, no discharge, no environmental impact.

Why Water-Injected Cooling Outperforms Air-Cooled Designs

Water injection achieves near-isothermal compression, which means the air temperature rises far less during compression compared to dry or air-cooled oil-free designs. This translates directly into higher volumetric efficiency (more air per kW of input power) and lower discharge temperatures, reducing the load on any downstream dryer. The isothermal efficiency advantage typically yields 8–12% energy savings over comparable dry-type oil-free compressors at full load.

Intelligent Control System

The KOF-30A features a 7-inch color touch screen controller with real-time monitoring of all critical parameters: discharge pressure, temperature, motor current, running hours, and maintenance schedules. The PLC-based system supports Modbus TCP/IP communication for integration into building management systems (BMS) and SCADA platforms, enabling remote monitoring and predictive maintenance alerts.

Key control features include:

• Auto start/stop: Pressure-band control with adjustable deadband minimizes unloaded running time
• Multi-machine sequencing: Up to 6 compressors can be linked for demand-based rotation, equalizing wear and optimizing energy
• Fault diagnostics: Real-time alarm display with fault history log and maintenance countdown timers
• Data logging: 12-month trend recording of pressure, temperature, and power consumption for compliance documentation

Certifications and Compliance

The KOF-30A holds ISO 8573-1 Class 0 certification, tested by an independent laboratory (TÜV) under the most stringent conditions — full load, full speed, and elevated ambient temperature. This certification covers oil concentration (aerosol + liquid + vapor) below 0.01 mg/m³ across the entire operating range, not just at a single test point.

Additional certifications include CE marking for European markets, ASME U-stamp for pressure vessels, and compliance with FDA 21 CFR Part 11 for pharmaceutical documentation requirements. The machine's construction materials — 316L stainless steel for all wetted air-path components — meet USP Class VI biocompatibility standards for medical and pharmaceutical applications.

Typical Applications

• Pharmaceutical cleanroom HVAC and process air (GMP Grade A/B/C areas)
• Hospital central medical air systems per HTM 02-01 and NFPA 99
• Dairy and beverage bottling lines requiring direct product contact air
• Chemical process instrumentation air where oil contamination causes catalyst poisoning
• Lithium battery manufacturing dry rooms where oil vapor compromises cell chemistry