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

	Suitable for applications requiring pressure or vacuum Static design
	Dry-running models available
	Vacuum up to -930 mbar rel (21 IN. HG.) with capacities of 280 l/min (10 CFM) max
	Pressure up to 1.4 bar (20.3 PSI)

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

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.