A rotary vane vacuum pump can be an oil-sealed rotary displacement pump. The pumping system
consists of a casing (1), an eccentrically installed rotor (2), vanes that move radially under spring
drive (3) and the inlet and outlet (4). The wall plug valve is oil-sealed. The inlet valve is designed as a
vacuum safety valve that is always open during operation. The working chamber (5) is situated
inside the casing. Rotor and vanes divide the working chamber into two separate spaces having
variable volumes. As the rotor turns, gas flows in to the enlarging Oil less Air Compressors suction chamber until it is sealed
off by the second vane. The enclosed gas is usually compressed before outlet valve opens against
atmospheric pressure. In the case of gas ballast operation, a hole to the exterior is opened, which
empties into the sealed suction chamber on the front side.
The Rotor moves by making use of a motor mounted on it.