Low Pressure Screw Compressor
When the air pressure ranges 0.2 to 0.5Mpa, conventional 0.7Mpa air compressor will cause a large amount of electricity consumption, but the low pressure screw air compressor with the same motor power can significantly increase the output of compressed air while saving power by 20 to 50%.
When a 0.7Mpa compressor is used, and the actual working pressure is 0.3Mpa, the screw air compressor first compress the air to 0.7Mpa and reduces the pressure to 0.3Mpa through reducing valve. In other words, the 0.3Mpa pressure is used to bear the power consumption caused by 0.7Mpa.
| Model | Power (kW) | Pressure (bar) | Free Air Delivery (m³/min) | Starting method | Outlet Size | Dimension (L×W×H) (mm) | Weight (kg) |
| | 37 | 3.5 | 10 | Permanent magnet frequency conversion | DN80 | 1800×1300×1900 | 2100 |
| 45 | 3.5 | 12 | DN80 | 2500×1600×1740 | 2200 | ||
| | 55 | 3.5 | 16 | DN80 | 2500×1600×1740 | 2400 | |
| | 75 | 3.5 | 21 | DN80 | 2850×1800×1912 | 3450 | |
| | 90 | 3.5 | 29 | DN80 | 2850×1800×1912 | 3500 | |
| | 110 | 3.5 | 37 | DN100 | 3440×2000×2320 | 4300 | |
| | 132 | 3.5 | 43 | DN100 | 3440×2000×2320 | 5400 | |
| | 160 | 3.5 | 48 | DN125 | 3720×2365×2385 | 6250 | |
| | 185 | 3.5 | 56 | DN125 | 3720×2365×2385 | 6400 | |
| | 200 | 3.5 | 62 | DN150 | 3720×2365×2385 | 7450 | |
| | 220 | 3.5 | 68 | DN150 | 4400×2350×2430 | 8200 | |
| | 250 | 3.5 | 74 | DN150 | 4400×2350×2430 | 8500 |
| Model | Power (kW) | Pressure (bar) | Free Air Delivery (m³/min) | Starting method | Outlet Size | Dimension (L×W×H) (mm) | Weight (kg) |
| | 45 | 4-5 | 11.5 | Permanent magnet frequency conversion | DN65 | 2500×1600×1740 | 2300 |
| | 55 | 4-5 | 14.7 | DN65 | 2500×1600×1740 | 2400 | |
| | 75 | 4-5 | 19.2 | DN80 | 2850×1800×1912 | 3450 | |
| | 90 | 4-5 | 24.2 | DN80 | 2850×1800×1912 | 3500 | |
| | 110 | 4-5 | 27.2 | DN100 | 3440×2000×2320 | 4300 | |
| | 132 | 4-5 | 32.5 | DN100 | 3440×2000×2320 | 4400 | |
| | 150 | 4-5 | 38 | DN125 | 3720×2365×2385 | 7200 | |
| | 160 | 4-5 | 40.7 | DN125 | 3720×2365×2385 | 7250 | |
| | 185 | 4-5 | 46.9 | DN125 | 3720×2365×2385 | 7400 | |
| | 200 | 4-5 | 50.6 | DN125 | 3720×2365×2385 | 7450 | |
| | 220 | 4-5 | 56.5 | DN150 | 4400×2350×2430 | 8600 | |
| | 250 | 4-5 | 65 | High frequency conversion | DN150 | 4400×2350×2430 | 8600 |
- By reducing the discharge pressure of the compressor as much as possible while ensuring normal production, energy savings of approximately 7-10% can be achieved for every 1 bar reduction in pressure.
- Low pressure screw compressors feature permanent magnet motors that save over 10% more energy than conventional motors and provide constant pressure output without causing pressure drop losses. They do not require frequent loading and unloading, resulting in energy savings of more than 30% compared to standard compressors.
- Centralized linkage control prevents the stepwise increase in discharge pressure that occurs when multiple compressors are set independently, reducing the waste of compressed air energy.
- By drawing air from outside, which is typically cooler than the air inside the compressor station, and maintaining clean, well-lubricated equipment, our compressors enhance heat dissipation and reduce energy loss.
- Low pressure screw compressor's waste heat is repurposed to heat cold water without additional energy consumption, addressing needs for domestic and industrial hot water and significantly reducing energy costs for businesses.
A screw air compressor of 132kW/0.7Mpa, the displacement is 24m3/min, while the displacement of a screw air compressor of 132kW/0.3Mpa is more than 37m3/min! Thus, the power consumption saved enables you to recover your investment within a year.
The internal compression ratio is automatically adjusted according to the actual working pressure, and the optimal power (energy efficiency) can be maintained within the displacement pressure range of 0.2-0.5Mpa. The forced lubrication of the oil pump ensures that there is sufficient fuel injection and a suitable air-oil mixing ratio under low pressure. Xinran low pressure screw compressor can help users reduce energy consumption by nearly 18%. We are one of the few manufacturers that can produce low-pressure screw air compressors.
