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Screw blowers represent an evolution in positive displacement technology for industrial applications. Thanks to their innovative internal rotary compression system, they move large volumes of pressurized air in a continuous, efficient, and quiet manner. This type of blower offers a robust and reliable solution for sectors requiring consistent performance, reducing energy consumption and optimizing operational costs.

How Do Screw Blowers Work?

The operating principle of a screw blower is based on progressive internal compression. Two helical rotors rotate in opposite directions inside a chamber, trapping air and compressing it as it moves toward the outlet. Unlike lobe (Roots-type) blowers, which simply transfer air without internal compression and generate pressure at the end of the process, screw designs increase pressure within the chamber itself—resulting in greater efficiency. Additionally, there is no contact between the rotating elements or with the casing, which means:

  • Less friction
  • Longer service life
  • Reduced maintenance needs

This technology enables smoother, quieter, and more energy-efficient operation.

Technical Advantages and Benefits of Screw Blowers

Energy Efficiency

Screw blowers are engineered to minimize electrical consumption, especially in continuous operations. Internal compression reduces energy losses, offering higher volumetric efficiency compared to traditional technologies.

Quiet Operation

Thanks to their precise mechanical design and pulsation-free flow, screw blowers operate at very low noise levels—often eliminating the need for external silencers. This improves workplace comfort and reduces soundproofing costs.

Reliability and Low Maintenance

With no contact between rotors and robust materials used in manufacturing, these units show minimal wear. They require fewer interventions, allowing for predictive maintenance programs that reduce downtime and unexpected costs.

Wide Range of Applications

Due to their performance and adaptability, screw blowers are ideal for:

  • Wastewater treatment plants

  • Fermentation and aeration processes in the food industry

  • Chemical and pharmaceutical applications

  • Pneumatic conveying in industries such as plastics, cement, or agriculture

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Oil free, highly efficient, low noise screw compressor

Extremely efficient oil-free compressor unit, in two versions: up to 1,000 mbar (g) with a maximum capacity of 10,100 m3/h and up to 2,500 mbar (g) with a maximum capacity of 9,400 m3/h.

Frequently Asked Questions about Screw Blowers

What’s the difference between a screw blower and a lobe blower?

The main difference lies in the air compression process. Lobe blowers (Roots type) simply move air without compressing it internally, generating pressure at the end. In contrast, screw blowers perform progressive compression inside the chamber, leading to higher energy efficiency and lower power consumption for the same flow and pressure. Additionally, screw blowers offer:

  • Lower noise and vibration

  • Smoother and more stable operation

  • Reduced need for auxiliary systems (silencers, filters, etc.)

What maintenance does a screw blower require?

Screw blowers require minimal and predictable maintenance, making them ideal for critical processes. Since there is no rotor contact, mechanical wear is reduced. Maintenance typically includes:

  • Periodic oil changes for bearing and gear lubrication

  • Air and oil filter inspections

  • Seal and bearing checks based on manufacturer recommendations

  • Temperature and vibration monitoring to detect potential issues

With a proper preventive maintenance program, these units can deliver long service life with minimal intervention.

Which industries are screw blowers recommended for?

Screw blowers are used across a wide range of industries that demand reliability, efficiency, and low noise, such as:

  • Wastewater treatment (aeration systems)

  • Pneumatic conveying of bulk solids

  • Chemical and pharmaceutical processes

  • Food and beverage industries

  • Biogas generation and industrial fermentation

  • Cement, paper, textile, and metallurgical plants

Their versatility and adaptability make them an efficient choice for multiple industrial applications.

How do I know if this technology is right for my plant?

To determine whether a screw blower is the right fit for your facility, consider the following factors:

  • Required air flow and operating pressure

  • Application type (continuous, intermittent, critical, etc.)

  • Environmental conditions (temperature, humidity, corrosive environments)

  • Energy efficiency targets and savings objectives

  • Long-term operation and maintenance costs

Our technical team can help analyze your case and propose the most suitable solution.

Customized Solutions with Screw Technology

In industrial environments where efficiency, low noise, and reliability are essential, screw blowers are a high-performance technological solution. Their advanced design and low maintenance costs make them a smart investment for plants seeking to optimize resources without compromising productivity.

At Pedro Gil, we manufacture and configure screw blowers to fit the specific requirements of each process. If you need technical advice, performance calculations, or a tailored proposal, don’t hesitate to contact us. We're here to help you boost your plant’s performance with efficient and long-lasting solutions.

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