Compared to traditional reciprocating air compressors, the core advantage of oil-injected rotary screw air compressors is their ability to provide a continuous, uninterrupted air supply (24/7) with stable, pulsation-free discharge pressure. Additionally, thanks to their twin-screw rotary meshing mechanism, vibration and noise levels are significantly lower than those of reciprocating units. At the same power rating, screw compressors typically deliver higher air output (CFM) and feature longer maintenance intervals—as the core air-end lacks wear-prone components like piston rings or intake/exhaust valves—thereby substantially reducing long-term operating costs and the risk of downtime.

It largely depends on the fluctuations in your factory’s air demand.

Choose a fixed-speed compressor: If your air demand is highly stable and the unit operates at full load throughout the day, a fixed-speed compressor is the option with a lower initial investment.

Choose a variable-speed compressor (VSD/permanent magnet VSD): If your air demand fluctuates significantly (e.g., due to multi-shift production or frequent starting and stopping of air-consuming equipment), we strongly recommend a variable-speed model. It automatically adjusts motor speed based on actual demand, saving up to 20%–35% on electricity costs. It also maintains pressure fluctuations within ±0.1 bar to ensure air supply quality while minimizing the impact on the power grid.

Oil-injected screw air compressors use lubricating oil for sealing, lubrication, and cooling; consequently, the discharged air contains trace amounts of oil. Standard, compliant models utilize high-efficiency oil-air separators to keep the oil content in the discharge air within the range of 2–3 ppm (mg/m³).
If your industry (such as food and beverage, pharmaceuticals, precision electronics, or spray painting) demands extremely high compressed air quality—requiring oil-free or Class 0 (ISO 8573-1) standards—we offer two solutions:

Install multi-stage precision filters and activated carbon filters downstream of the oil-injected compressor to reduce oil content to below 0.01 ppm.

Opt directly for our oil-free screw air compressor series, which achieves 100% oil-free compression at the source.

“High-temperature tripping” is the most common protective shutdown for screw compressors. The primary causes and preventive measures are as follows:

1. Radiator/Cooler clogging (most common): Dust and oily residue in the factory environment clog the cooling fins. Prevention: Regularly blow out the radiator from the inside out using low-pressure compressed air or a specialized cleaning agent.
2. Insufficient or degraded cooling oil: Affects heat exchange efficiency. Prevention: Change the oil according to the maintenance schedule.
3. Oil filter clogging: Reduces lubricating oil flow. Prevention: Replace the filter element at scheduled intervals.
4. Poor ambient ventilation: Excessive temperature in the compressor room. Prevention: Ensure the compressor room has adequate ventilation and heat dissipation.

We provide comprehensive after-sales support to minimize your maintenance risks:

• Machine Warranty: We typically offer a 12-month warranty on the entire unit (calculated from the date of manufacture shown on the machine’s nameplate).
• Spare Parts Supply: We maintain long-term stocks of maintenance kits and commonly used wear parts for all models to ensure timely supply.
• Value-Added Services: We offer customized preventive maintenance contracts featuring regular inspections by our professional engineers, giving you complete peace of mind.