Rotary Screw Air Compressor Manufacturer in Shanghai — Oil-Free, PM VFD & Two-Stage Systems

On sites with fluctuating air demand, permanent magnet variable frequency compressors typically save 20–40% of electricity compared with fixed-speed load/unload machines, because motor speed follows actual consumption instead of idling. Savings depend on your demand profile, so we recommend a load profile review before sizing.

Choose oil-free whenever compressed air touches the product or process — food and beverage, pharmaceuticals, electronics, textiles and painting. Dry-type and water-lubricated designs deliver Class 0 air per ISO 8573-1 and remove the risk of oil carry-over contamination.

Required free air delivery (m³/min or CFM), working pressure (bar or MPa), daily running hours and demand variation, required air quality class, supply voltage and frequency, cooling preference (air or water), ambient temperature and site altitude.

Yes. We supply OEM and ODM compressors with custom voltage such as 380 V, 400 V or 415 V, controller language, enclosure color, branding and integrated configurations combining compressor, air tank, dryer and filters.

Two-stage compression splits the pressure ratio between two rotor sets with inter-stage cooling. This lowers compression temperature and internal leakage, giving higher specific efficiency than single-stage units — especially for large flows and continuous duty.