At the core of an oil free screw compressor is a rotary screw mechanism that compresses air using two helical rotors. Unlike standard lubricated compressors, an oil free rotary screw air compressor eliminates oil in the compression chamber altogether. This is achieved through advanced engineering, precision manufacturing, and the integration of alternative cooling methods such as water injected systems.

In the world of HVAC systems and industrial applications, the choice between scroll compressors and screw compressors is a key decision that affects energy efficiency, quiet operation, and overall system performance. Both technologies have unique strengths, and selecting the right one requires an understanding of how each functions, the operating conditions, and specific project requirements.

A rotary screw air compressor is a type of screw air compressor that uses two meshing helical screws—referred to as rotors—to compress air. These compressors are designed for continuous operation and are ideal for applications with a wide range of air demand.

When it comes to industrial compressed air systems, one of the most efficient and widely used technologies is the rotary screw air compressor. Within this category, two main types exist: oil-injected screw compressors and oil-free screw compressors. This blog focuses on answering the critical question: Why is oil injected in a screw air compressor? In doing so, we’ll explore the working principle of oil-injected compressors, highlight key components such as the inlet valve and motor speed, and examine how these machines meet application requirements across a wide range of industries including food and beverage, manufacturing, and more.