As global industries push harder for energy efficiency and operational reliability, OPPAIR, a leading manufacturer of industrial compressed air solutions, is proud to introduce its comprehensive Two-Stage Screw Air Compressor lineup, engineered to deliver exceptional performance across a wide pressure spectrum: 3 to 5 bar (low pressure), 8 to 15 bar (standard pressure), and 20 to 30 bar (high pressure).
Whether you are running a wastewater treatment plant, a chemical processing facility, a laser cutting workshop, or a large-scale manufacturing line, OPPAIR’s two-stage technology brings unmatched energy saving, high efficiency, and low noise to your production floor.
What Is Two-Stage Compression – And Why Does It Matter?
In a conventional single-stage screw compressor, air is compressed from atmospheric pressure to working pressure in a single pass – a process that generates excess heat and wastes energy. OPPAIR’s two-stage compression design splits this process into two sequential stages, allowing the air to cool between stages. The result:
- Energy savings of 15-30% compared to equivalent single-stage compressors at the same output
- Lower discharge temperatures, extending the lifespan of wear parts and lubricants
- More stable air delivery across a wide range of working pressures
- Lower noise levels – down to 65 dB(A) on the Pro Series, quieter than most single-stage units of the same power
Three Pressure Ranges. One Solution Family.
① Low Pressure Series – 3 to 5 bar
Designed for applications that require large volumes of air at lower pressures – including fermentation, aeration, wastewater treatment, pneumatic conveying, and textile processing – OPPAIR’s low-pressure two-stage PM VSD screw compressors deliver clean, continuous airflow at 3 to 5 bar with outstanding energy efficiency. The PM VSD (Permanent Magnet Variable Speed Drive) inverter automatically adjusts motor speed to match real-time demand, eliminating the energy waste of fixed-speed unloading cycles.
② Standard Pressure Series – 8 to 15 bar
The flagship of OPPAIR’s two-stage family, available in two sub-series:
- Standard Series (Baosi Air End) – OPT-30 to OPT-350: power range 22-250 kW (30-350 hp), air delivery up to 43.75 m³/min at 8 bar, working pressures of 8 / 10 / 13 / 15 bar. Noise level from 68 dB(A) (small models) to 84 dB(A) (350 kW). PM VSD with direct drive and variable frequency start as standard.
- Pro Series (Hanbell Air End) – OPT-40 Pro to OPT-350 Pro: power range 30-250 kW, delivering up to 50.34 m³/min at 8 bar. Pro Series achieves a noise floor of just 65 dB(A) on smaller models – a significant advantage in noise-sensitive environments. Same working pressures: 8 / 10 / 13 bar.
Both series feature PM VSD with inverter, direct drive, and variable frequency start – hallmarks of modern high-efficiency compressor design.
③ High Pressure Series – 20 to 30 bar
For demanding applications such as PET bottle blowing, high-pressure laser cutting, and industrial gas compression, OPPAIR offers high-pressure integrated solutions reaching 20 to 30 bar. The 20 bar 4-in-1 integrated model (featuring a Hanbell AH air end) combines screw compressor, air tank, air dryer, and precision line filter into a single compact unit. Key features include:
- Energy-saving and efficient – not prone to high temperature
- Extra-large air tank for stable air supply and moisture removal
- High-efficiency plate-exchange air dryer for deep water removal
- Precision line filter capable of filtering down to 0.01 μm
- Minimal vibration and low noise operation
Core Advantages of OPPAIR Two-Stage Compressors
| Advantage | Details |
| Energy Saving | 15-30% lower power consumption vs. single-stage at equal output |
| High Efficiency | PM VSD inverter matches output to demand in real time, eliminating unload waste |
| Low Noise | 65-84 dB(A) depending on model; Pro Series starts at just 65 dB(A) |
| Wide Pressure Range | 3 to 5 bar / 8 to 15 bar / 20 to 30 bar – one brand covers every application |
| Direct Drive | No belt wear, lower maintenance cost, higher transmission efficiency |
| Premium Air Ends | Baosi & Hanbell dual-brand air ends – proven reliability at scale |
| Certifications | CE, SGS, ASME, TÜV, ISO – globally compliant |
| Warranty | 18 months whole-machine standard; IP65 PM VSD: 3 years machine + 4 years motor |
Typical Application Industries
- 3 to 5 bar: Wastewater aeration, fermentation tanks, pneumatic conveying, textile weaving machines
- 8 to 15 bar: General manufacturing, automotive assembly, electronics production, food & beverage, metallurgy, pharmaceuticals
- 20 to 30 bar: PET bottle blowing lines, high-pressure laser cutting, industrial gas filling, cylinder charging
About OPPAIR
Shandong OPPAIR Machinery Manufacturing Co., Ltd. and OPPAIR Compressor (Shanghai) Co., Ltd. together form the OPPAIR Group – a globally trusted manufacturer of industrial air compressors with products exported to over 100 countries. All products carry international certifications including CE, SGS, ASME, TÜV, and ISO. Delivery lead time: 30 days.
Visit us at www.oppaircompressor.com or contact our global sales team to find the right two-stage compressor solution for your application.
- OPPAIR: Quality, Reputation, Service Is Our Life.
OPPAIR is looking for global agents, welcome to contact us for inquiries:
📞 TEL/Wechat/WhatsApp: +86 14768192555
📧 Email: Info@oppaircompressor.com
🌐 Website: https://www.oppaircompressor.com/
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Post time: Sep-15-2026
