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Low-pressure two-stage screw compressors utilize a two-stage compression structure, specifically designed for low discharge pressures (typically 0.3-1.0 bar) and high flow requirements. Through two-stage compression and intercooling, they achieve efficient and stable low-pressure air output, making them suitable for industrial applications requiring large quantities of low-pressure air.
Product Parameters
| 5.5 bar Low-pressure Two-stage PM VSD Screw Air Compressor | ||||||
| Model | Air Delivery (m³/min) | Power (kW/hp) | Noise dB(A) | Outlet diameter | Dimensions(mm) | Weight (kg) |
| 5.5 bar | L*W*H | |||||
| RL75APMII | 15.0 | 55175 | 70 | DN65 | 2450*1700*1760 | 1800 |
| RL100APMII | 19.2 | 75/100 | 70 | DN65 | 2450*1700*1760 | 2000 |
Features and Advantages
1. Two-stage compression
Gas is compressed in two stages, with intercooling to lower the temperature, reduce energy consumption, and improve efficiency.
2. Low pressure, high flow rate
Low exhaust pressure (0.3-1.0 bar) and high flow rate (up to 1000 m³/min or more) are ideal for applications requiring stable low pressure.
3. Energy-efficient and highly efficient
10%-20% energy savings compared to single-stage compression, reducing operating costs.
4. Low-temperature operation
The intercooler lowers the secondary intake temperature, reducing thermal stress and extending equipment life.
5. Low vibration and low noise
The screw structure operates smoothly, with quieter operation than piston compressors. 6. Intelligent control: Variable frequency control and PLC control adapt to load changes and avoid energy waste.
Key Application Industries
Wastewater Treatment Used in aeration systems to provide stable, low-pressure air to promote microbial decomposition.
Textile Industry: Power source for air-jet spinning and looms.
Food and Beverage Industry: Fermentation, packaging, and conveying (oil-free models required).
Chemical/Pharmaceutical Industry: Material handling and reactor agitation.
Power Industry: Flue Gas Desulfurization (FGD) aeration.
Electronics Manufacturing: PCB cleaning and air supply for pneumatic tools.
FAQ
Q1: What are the advantages of a two-stage screw compressor compared to a single-stage one?
A1: Two-stage compression reduces the load per stage, minimizes leakage and temperature rise, and offers higher efficiency, making it particularly suitable for long-term continuous operation.
Q2: Is an aftercooler required?
A2: Usually, it is, especially in high-temperature environments or when high air quality is required. An aftercooler can further reduce temperature and dehumidify the air.
Q3: How should I choose a compressor?
A3: Choose based on the actual flow rate and pressure required, leaving a 10%-15% margin to handle peak demand.
Q4: What is the maintenance interval?
A4: Routine maintenance (oil change, filter change, etc.) is performed every 4,000-8,000 hours. Please refer to the manufacturer's recommendations for specific requirements.
Q5: Can it replace a Roots blower?
A5: Yes, screw compressors offer higher efficiency and lower noise, but the initial investment cost is higher.
Q6: How should I choose between oil-free and oil-filled compressors?
A6: For industries that require oil-free air, such as food and medicine, choose oil-free models; for general industries, oil-containing models can be used (oil filtration is required later).
Low-pressure two-stage screw compressors utilize a two-stage compression structure, specifically designed for low discharge pressures (typically 0.3-1.0 bar) and high flow requirements. Through two-stage compression and intercooling, they achieve efficient and stable low-pressure air output, making them suitable for industrial applications requiring large quantities of low-pressure air.
Product Parameters
| 5.5 bar Low-pressure Two-stage PM VSD Screw Air Compressor | ||||||
| Model | Air Delivery (m³/min) | Power (kW/hp) | Noise dB(A) | Outlet diameter | Dimensions(mm) | Weight (kg) |
| 5.5 bar | L*W*H | |||||
| RL75APMII | 15.0 | 55175 | 70 | DN65 | 2450*1700*1760 | 1800 |
| RL100APMII | 19.2 | 75/100 | 70 | DN65 | 2450*1700*1760 | 2000 |
Features and Advantages
1. Two-stage compression
Gas is compressed in two stages, with intercooling to lower the temperature, reduce energy consumption, and improve efficiency.
2. Low pressure, high flow rate
Low exhaust pressure (0.3-1.0 bar) and high flow rate (up to 1000 m³/min or more) are ideal for applications requiring stable low pressure.
3. Energy-efficient and highly efficient
10%-20% energy savings compared to single-stage compression, reducing operating costs.
4. Low-temperature operation
The intercooler lowers the secondary intake temperature, reducing thermal stress and extending equipment life.
5. Low vibration and low noise
The screw structure operates smoothly, with quieter operation than piston compressors. 6. Intelligent control: Variable frequency control and PLC control adapt to load changes and avoid energy waste.
Key Application Industries
Wastewater Treatment Used in aeration systems to provide stable, low-pressure air to promote microbial decomposition.
Textile Industry: Power source for air-jet spinning and looms.
Food and Beverage Industry: Fermentation, packaging, and conveying (oil-free models required).
Chemical/Pharmaceutical Industry: Material handling and reactor agitation.
Power Industry: Flue Gas Desulfurization (FGD) aeration.
Electronics Manufacturing: PCB cleaning and air supply for pneumatic tools.
FAQ
Q1: What are the advantages of a two-stage screw compressor compared to a single-stage one?
A1: Two-stage compression reduces the load per stage, minimizes leakage and temperature rise, and offers higher efficiency, making it particularly suitable for long-term continuous operation.
Q2: Is an aftercooler required?
A2: Usually, it is, especially in high-temperature environments or when high air quality is required. An aftercooler can further reduce temperature and dehumidify the air.
Q3: How should I choose a compressor?
A3: Choose based on the actual flow rate and pressure required, leaving a 10%-15% margin to handle peak demand.
Q4: What is the maintenance interval?
A4: Routine maintenance (oil change, filter change, etc.) is performed every 4,000-8,000 hours. Please refer to the manufacturer's recommendations for specific requirements.
Q5: Can it replace a Roots blower?
A5: Yes, screw compressors offer higher efficiency and lower noise, but the initial investment cost is higher.
Q6: How should I choose between oil-free and oil-filled compressors?
A6: For industries that require oil-free air, such as food and medicine, choose oil-free models; for general industries, oil-containing models can be used (oil filtration is required later).
