Rotary Vane Technology

The rotary vane air-end cylinder is the core of Pneumofore’s technology. This enduring and proven design offers a wider range of benefits than other single-stage air compressor and vacuum pump types, such as screw or liquid ring. Pneumofore has optimized its functionality and improved its performance for nearly a century.


The Pneumofore rotary vane air-end comes in compressor or vacuum pump versions that have only slight differences. The basic principle is the same for both. The air-end consists of several sliding blades set into a rotor which turns on an eccentric axis within a static, air-tight cylinder. When the rotor turns, the centrifugal force causes the blades to slide and extend out of the rotor’s longitudinal grooves. In their extended state, these blades function like vanes that adjust to the cylinder’s shape as they are driven by the rotor.

Incoming air enters the air-end when the pressure-activated air inlet valve, which is a regulating piston, opens once designed operating conditions are reached. 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, the air exits through the outlet. In compressors, the intensive injection of coolant reduces the overall temperature of the compression cycle and ensures copious lubrication. The injected coolant also functions as an active sealant to keep the vanes airtight.


Simple Design With Few Moving Parts
Sturdy, compact construction, easy to access and maintain, easy replacement of parts, extremely reliable and durable.

Single-Stage Compression
The nature of the design produces sufficient compression in a single stage, resulting in a high compression ratio during a single 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.

Precise Testing Procedures