The Rotary Vane Principle

Rotary Vane Principle 200     

The rotary vane cylinder lies at the core of Pneumofore's technology. As the most reliable concept for single-stage rotary compressors and vacuum pumps, this proven design offers a full range of advantages. Over decades of research, Pneumofore has optimized its core functionality and improved its performance through numerous innovations. The following outline describes the basic design of any rotary vane air-end. 

Simple, Compact Design
Sturdy construction with few moving parts, easy to access and maintain, easy to replace parts, very reliable and durable. See diagram below for details.

Single-Stage Compression
The nature of the design produces sufficient compression in a single stage, resulting in a very high compression ratio during cycle (about 10:1), as well as better energy efficiency, reduced risk of fault and reduced maintenance requirements.

Direct Axial Coupling to the Motor
Direct coupling is possible because the high compression ratio permits low rotation speeds, eliminating the need for transmission or gears. Fewer parts means lower energy dissipation and simplified maintenance.

Low Rotation Speeds

Lower speeds reduce vibration, thus diminishing noise and wear, lowering temperature and eliminating the need for foundations.

Low Cycle Temperature
Lower temperatures reduce wear, coolant consumption and leakage caused by distension of parts. Less energy is needed for cooling, and the purity of delivered air is enhanced.

Low Need for Maintenance
With fewer parts suffering little wear, single-stage rotary vane units offer cleaner and more reliable operation, significantly reducing maintenance needs.

How it Works 

Components in Cylinder
The rotary vane compressor consists of a moving core element, the rotor [6] with sliding blades [4], which turns on an eccentric axis within a static cylinder [3]. Due to centrifugal forces caused by the rotation, the blades slide and extend out of the rotor's longitudinal grooves [5]. In their extended state, these blades function like vanes that adjust to the cylinder's shape as they are driven by the rotor.

Compression Cycle
Incoming air [1] enters the compressor when the regulating piston [2] yields to pressure states in the air circuit. The air is drawn into the cylinder by the rotating vanes, which enclose space hermetically as they course through the compression area. The air is compressed as the volumes between the vanes are reduced due to the eccentricity of the cylinder wall and the rotor. After maximum compression [7], the air exits through the outlet [8]. Intensive injection of coolant [9] reduces the overall temperature of the compression cycle and ensures copious lubrication. The injected coolant also functions as sealant to keep the vanes airtight.

copling and motor








Direct coupling of air-end and motor: no gears or belts,  low speed, low vibration, higher efficiency, no maintenance of transmission.


Learn more about the rotary vane principle in our Educational Multimedia section.

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  • Educational Multimedia
    Interactive and educative animations showing construction, operation and other aspects of our technology
  • Vacuum Pumps
    Rotary vane vacuum systems for small and large applications require high efficiency and reliability
  • Innovation
    Constant evolution in efficiency, capacity and performance over more than eight decades.
  • A Series
    A Series with pressures from 2,5 to 10 bar(g) and capacity from 67 to 2.037 m³/h for industrial applications

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