Rotary vane vacuum pumps and compressors operate by compressing volume in order to increase pressure.

	Suitable for applications requiring pressure, vacuum or pressure/vacuum simultaneously
	Static design
	Oil lubricated or dry-running models available
	Vacuum up to 0.5 mbar (abs) with capacities 0.06 to 1535 m³/hr
	Pressure up to 2.0 bar with capacities from 0.06 to 610 m³/hr
	When used as pressure/vacuum combined unit, 0.7 bar pressure and 0.6 bar vacuum can be achieved simultaneously

Technical Overview
Pressure increase by volume reduction is the principle behind rotary vane operation.

This static design offers excellent service in pressure, vacuum or a combination of both. Depending upon size and design - i.e. oil lubricated or dry running - vacuum up to 0.5 mbar (abs) with capacities ranging from 0.06 to 1535 m³/hr and pressures up to 2.0 bar with capacities ranging from 0.06 to 610 m³/hr can be reached. When used as a combined unit, 0.6 bar vacuum and 0.7 bar pressure can be achieved simultaneously.

The Rotary Vane Principle
In a cylindrical housing a rotor is positioned eccentrically so that it is on the top almost touching the cylinder. Rotor blades are positioned into numerous rotor slots. When the rotor starts turning, due to centrifugal force the blades are thrown out and slide against the internal surface of the cylinder. In this way a cell is formed between two blades with a volume which changes constantly during rotation. Air enters from the inlet port into a cell until the rear blade reaches the inlet port. At this point the cell has achieved its maximum air volume.

As the cell then moves away from the port its volume becomes smaller and smaller, the air is thus compressed and the pressure rises. This continues until the pressure in the cell exceeds that in the pressure chamber and the air then exits through the outlet port. Some models are fitted with exhaust valves which stop the backflow of this discharged air if the maximum pressure has been reached. In a vacuum pump the process is similar, but the cell gives decreasing pressure, and the chamber is at atmospheric pressure.

On pressure/vacuum pumps the lower end of the inlet port(s) for the vacuum is moved forward. This provides the ability to fill the cell from a second inlet. To avoid impairing the vacuum, this second inlet port is located about one cell segment away from the main suction port. The ratio between vacuum and pressure capacities can be influenced by the arrangement of the inlet ports.