A rotary vane vacuum pump can be an oil-sealed rotary displacement pump. The pumping system
consists of a housing (1), an eccentrically installed rotor (2), vanes that move radially under spring
drive (3) and the inlet and outlet (4). The outlet valve is usually oil-sealed. The inlet valve is designed as a
vacuum safety valve that’s always open during operation. The working chamber (5) is situated
inside the casing. Rotor and vanes divide the operating chamber into two separate spaces having
adjustable volumes. As the rotor turns, gas flows into the enlarging suction chamber until it is sealed
off by the next vane. The enclosed gas can be compressed until the outlet valve opens against
atmospheric pressure. In the case of gas ballast operation, a hole to 
the exterior is opened, which
Scroll Vacuum Pumps empties into the sealed suction chamber on leading side.
The Rotor moves with the help of a motor attached to it.
