Rotary Screw Compressors | ELGi Efficient Screw Air Compressors

ELGi ROTARY SCREW AIR COMPRESSORS — RELIABLE, EFFICIENT & BUILT TO LAST

WHAT IS A ROTARY SCREW COMPRESSOR?

A rotary screw air compressor is a positive-displacement machine that uses two helical rotors to compress air, delivering a continuous, reliable flow of compressed air for industrial applications. ELGi offers a complete range of rotary screw technologies, helping customers in selecting the right rotary screw air compressor based on their Compressed air demand and operating conditions. Our portfolio includes oil-injected compressors — also known as oil-lubricated, oil-flooded, oil-cooled, or contact-cooled compressors — designed for high efficiency and durability, as well as oil-free or oil-less compressors that deliver Class ‘0’ oil-free compressed air for sensitive applications. ELGi’s oil-free air compressors offer Class ‘0’ oil-free compressed air, reducing contamination risks across industries such as for food & beverage, pharmaceuticals, and electronics. Because of its multiple advantages, an oil-free air compressor is a vital solution for businesses focused on energy efficiency, sustainability, and uncompromised compressed air quality.

EXPLORE OUR ROTARY SCREW AIR COMPRESSORS

ELGi’s complete range of screw type air compressors, designed for performance and reliability.

OIL-LUBRICATED COMPRESSOR OIL-FREE COMPRESSOR

OIL-LUBRICATED COMPRESSOR

Oil‑injected compressors – ideal where a low oil carryover is acceptable, but high efficiency and reliability are required.

Looking for Class Zero, oil-free compressed air? Explore ELGi’s OF & AB Series oil-free compressors

OIL-FREE COMPRESSOR

Oil‑free screw air compressors – for applications needing Class ‘0’ oil-free compressed air
(food & beverage, pharmaceuticals, electronics).

Technical Specifications

Model Series	Power Range	Working Pressure	Max Air Flow	Types	Special Feature
EN Series	2.2‑15 kW	7 bar g to 12.5 bar g	0.26m3/min to 2.05 m3/min	Oil‑lubricated	Small footprint
EQ Series	11-45kW	7 bar g to 15.5 bar g	0.95 m3/min to 8.38 m3/min	Oil-lubricated	Built tough for long-lasting performance
EG Series	11‑250 kW	4.5 bar g to 12.5 bar g	1.38 m3/min to 43.18 m3/min	Oil-lubricated	High efficiency
EG SP Series	75-250 kW	7 bar g to 12.5 bar g	11.75 m3/min to 43.2 m3/min	Oil-lubricated	Sets the standard in energy-saving
EG PM Series	11-55 kW	7 bar g to 12.5 bar g	2.1 m3/min to 11.3 m3/min	Oil-lubricated	16% reduction in power consumption
OF Series	45-450 kW	7 to 10 bar g	5.38 m3/min – 49.30 m3/min	Oil-Free	Class ‘0’ compressed air
AB Series	11-110 kW	7 bar g to 12 bar g	0.85 m3/min to 15.9 m3/min	Oil-Free	Class ‘0’ compressed air / Water-injected

Features & Benefits of ELGi Rotary Screw Compressors

Manufacturing & General Industry

Rotary screw air compressors in general manufacturing businesses operate pneumatic tools, conveyors, air knives, labelers. General manufacturing companies require reliable compressed air since they often need to operate 24/7. A reliable air compressor is thus of high importance for them.

Food & Beverage

Rotary screw air compressors play a crucial role in food processing plants. They are used to maintain the freshness and quality of finished food products. These compressors ensure a reliable source of compressed air, which is essential for processes like packaging, sealing, and pneumatic conveyance. They use both oil-free rotary screw compressors and oil-lubricated rotary screw compressors. In breweries for example, rotary screw air compressors are employed for a range of tasks. They provide compressed air for bottling lines, kegging operations, and other pneumatic applications. The consistent supply of clean compressed air is essential to maintain product quality and ensure efficient operations.

Automotive

Automotive production often takes place around the assembly line, meaning that reliability is of utmost importance to keep the assembly line moving. Compressed air is used for a variety of applications within automotive productions, such as for: Powering of pneumatic tools and paint spray guns and tire inflation.

Electronics

Electronics applications are often sensitive and require high quality, dry, oil-free compressed air for various processes, such as cleaning of electronic components, powering of pneumatic tools, and component handling. Oil-free rotary screw air compressors can meet the electronics industry’s requirements of high-quality, oil-free compressed air.

Heavy industries such as paper, metal, energy

Rotary screw air compressors offer various advantages for the metalworking sector, such as reliability and energy efficiency. Compressed air is needed to operate air tools, for blasting and cleaning and for a pneumatic control system to actuate valves, and manage the movement of metal parts and components.

WHAT IS THE WORKING PRINCIPLE OF ELGi ROTARY SCREW AIR COMPRESSORS?

The rotary screw air compressor working principle is based on a rotary-type, positive-displacement mechanism that uses two helical rotors to compress air efficiently. As the rotors in the rotary screw compressor rotate in opposite directions, atmospheric air is drawn in, trapped between the rotors, and gradually compressed before being discharged as clean compressed air.

A fine layer of oil provides sealing, cooling, and lubrication to rotors inside oil-injected rotary screw air compressors (also known as oil-flooded, oil-cooled, or contact-cooled compressors) for consistent and dependable operation. In oil-free rotary screw air compressors, precision timing gears maintain rotor synchronization without oil, ensuring Class ‘0’ oil-free compressed air.

ELGi, one of the leading rotary screw air compressor manufacturers, designs advanced electric screw compressors such as the EG and EN Series for high efficiency, durability, and continuous airflow. These rotary air compressors or screw type compressors are ideal for industrial use, offering energy savings, low maintenance, and proven reliability.

If you’re exploring a screw compressor, ELGi’s wide range of screw air compressors combines performance, quality, and efficiency in one compact solution.

Why Choose ELGi

Leading rotary screw compressor manufacturers investing in research & development.
Wide product range (EN, EG, EQ Series & AB, OF Series), and compressed air accessories.
High efficiency and low operating cost.
Strong after-sales support and warranty.

HOW HAS ELGi ENHANCED THEIR ROTARY SCREW COMPRESSOR PROFILE?

The profile of ELGi’s rotary screw air compressors has various segments of different shapes.
ELGi’s rotary screw air compressors utilise a large positive displacement, effectively increasing the inlet air’s pressure by reducing its volume.
The presence of a robust female rotor in the screw compressor facilitates continuous extraction of more air while minimising space requirements.
A short sealing line ensures consistent sealing along the entire contact length, eliminating the necessity for a sealing strip.
Improved clearance distribution enhances the compressor’s performance.

WHAT ARE THE KEY ADVANTAGES OF ROTARY SCREW AIR COMPRESSORS?

Rotary screw air compressors produce continuous flow of compressed air for various applications, providing high reliability.
Rotary air compressors operate efficiently at extremely high or low temperatures (up to 50°C).
Rotary screw air compressors come with low maintenance costs compared to other compressor technologies.
Rotary screw compressors are durable.
Screw compressors produce low noise and therefore are compliant with local work safety regulations.
Rotary compressors have minimal oil carryover, as low as one part per million (ppm) for oil-lubricated rotary compressors.

FREQUENTLY ASKED QUESTIONS

What is the difference between a rotary screw air compressor and a piston compressor?

A rotary screw compressor delivers a continuous flow of compressed air with higher efficiency and lower noise, while piston compressors are better suited for intermittent use.

How does a rotary screw air compressor save energy?

Modern screw compressors use efficient airends, variable frequency drives, and advanced control systems to match output with demand, reducing power consumption and operating costs.

Which industries use rotary screw compressors?

Screw air compressors are widely used in manufacturing, food & beverage, pharmaceuticals, automotive, and electronics industries where reliable, continuous compressed air is essential.

How often should my rotary screw air compressor be serviced?

Regular maintenance checks are essential to identify potential issues such as leaks, pressure drops, and temperature changes in your rotary screw compressor. To ensure its efficient operation, consider subscribing to ELGi’s maintenance plans for your rotary screw compressor.

How do I choose the right size and capacity of a rotary screw air compressor for my needs?

Analyse the total air demand of your application and consider the required air flow for both current and future air demand. Understand the required operating pressure which helps to determine the compressor’s discharge pressure capability. Evaluate the compressor’s duty cycle for continuous operation. Determine the available space for the compressed air system and ensure it meets the clearance and ventilation requirements. Also consider additional features, such as variable speed drives, for energy saving, an advanced control system for efficient operation and sound proofing options where noise is a concern in your working environment. Contact the ELGi experts for customised advise.

ELGi ROTARY SCREW AIR COMPRESSORS

EXPLORE OUR ROTARY SCREW AIR COMPRESSORS

OIL-LUBRICATED COMPRESSOR

Looking for Class Zero, oil-free compressed air? Explore ELGi’s OF & AB Series oil-free compressors

OIL-FREE COMPRESSOR

Features & Benefits of ELGi Rotary Screw Compressors

Why Choose ELGi

Advantages of a screw compressor with dryer

Working Principle of rotary screw compressors

How to choose the right rotary screw compressors

Factors to consider when selecting a rotary screw compressor

Exploring the Key Advantages of an Oil-free Air Compressor

Class Zero Air – Achieve your sustainability goals while ensuring regulation compliant product quality

Oil-Free or Oil-Lubricated Screw Compressors: ELGi’s Guide to Choose the Right Technology for Your Application

Safeguarding Your Compressed Air Assets

Why to choose for a variable speed compressor vs. fixed speed compressor?