A stable and efficient compressed air system is a basic requirement for many industrial operations. To simplify installation, reduce footprint, and improve energy efficiency, more manufacturers are choosing the four-in-one oil-injected rotary screw compressor, also known as an all-in-one screw air compressor. This integrated solution combines multiple air treatment components into a single compact unit, delivering clean dry compressed air with lower total ownership cost.
This article explains how a 4-in-1 rotary screw air compressor works, how to select the right model, and where it is commonly used in industrial applications.
A four-in-one oil-injected rotary screw compressor is an integrated air compressor system that combines the following components into one compact unit:
This design allows the compressor to produce high quality compressed air while saving installation space and simplifying system layout. The compressor uses oil flooded screw technology for stable operation and long service life.
Unlike traditional systems that require separate equipment and piping, this compact compressed air solution is delivered as a factory-assembled unit.
The core of the system is the oil-injected screw compressor, which uses injected oil to seal, cool, and lubricate the compression chamber. This design supports high efficiency, stable pressure output, and continuous operation.
The built-in air compressor refrigerated air dryer removes moisture from compressed air, ensuring dry air supply and reducing the risk of corrosion, condensation, and downstream equipment damage.
The integrated air tank stores compressed air, smooths pressure fluctuations, and reduces frequent start-stop cycles, contributing to energy saving operation.
Filters remove oil mist and solid particles, helping deliver clean dry compressed air suitable for most industrial processes.
Many buyers compare oil injected rotary screw compressors with oil free systems. Each has different advantages:
For most factories, an oil flooded rotary screw air compressor with proper filtration provides high quality compressed air while maintaining excellent energy efficiency.
A proper industrial air compressor selection should be based on air demand, operating conditions, space availability, and long-term operating efficiency. When evaluating a four-in-one oil-injected rotary screw compressor, the following factors help ensure a suitable match for your compressed air system.
Begin by determining the required airflow (CFM or m³/min) and working pressure according to actual production demand. Many all-in-one screw air compressors are designed to cover a wide operating range, such as 8–16 bar (116–232 psig), with flexible air capacity to support different industrial loads. Integrated solutions like the DREAM DHV-SAT series provide stable output across 0.2–3.8 m³/min (7.1–134.2 cfm), making them suitable for workshops with variable air demand.
Motor power should match the real operating load rather than peak demand alone. Selecting an oversized unit often leads to unnecessary energy consumption. Oil-injected rotary screw compressors equipped with permanent magnet frequency conversion technology (VSD) can automatically adjust speed to maintain constant pressure, reducing air waste and supporting long-term energy saving operation. Power ranges such as 5.5–22 kW (7.5–30 hp) are commonly used for small to medium industrial applications.
Installation space, ventilation conditions, and ambient temperature should be carefully considered. A four-in-one compact unit that integrates the compressor, air compressor refrigerated air dryer, air tank, and filtration system can significantly reduce floor space requirements. For example, systems with an integrated 420L air tank simplify installation and are well suited for workshops with limited space. Low-noise designs using centrifugal cooling fans also improve the working environment.
Different processes require different air quality levels. If your operation requires clean dry air, ensure the integrated dryer and filtration system can effectively remove moisture and oil content. A properly designed oil flooded four-in-one rotary screw air compressor can deliver high quality compressed air suitable for most industrial applications, while oil free compressors are typically selected only when zero oil content is mandatory.
Because of their integrated air design and reliable output, rotary screw air compressors in four-in-one configuration are widely used in:
These applications benefit from stable pressure, high efficiency, and simplified compressed air system layout.
Using an all-in-one screw air compressor offers several practical advantages:
This makes injected rotary screw compressors a preferred option for factories seeking a cost effective and reliable compressed air solution.
It refers to a single unit that integrates a screw compressor, air dryer, air tank, and filtration system.
Yes. Oil injected rotary screw compressors are designed for continuous industrial use and stable output.
With proper filtration and a refrigerated dryer, it can deliver clean dry compressed air suitable for most industrial applications.
Yes. Integrated design reduces pressure loss, shortens air paths, and supports overall energy saving performance.
Choose oil free systems only when industry regulations require zero oil content, such as medical or pharmaceutical applications.
A four-in-one oil-injected rotary screw air compressor offers a practical balance of performance, space efficiency, and operating cost. By combining compression, drying, storage, and filtration into a compact compressed air solution, it simplifies system design while delivering high quality compressed air for a wide range of industrial applications.
For manufacturers seeking a reliable, high efficiency, and cost effective compressed air system, the all-in-one screw air compressor is an increasingly popular choice.
