A China Pulley rotary vane vacuum pump 
is 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
power (3) and the inlet and wall plug (4). The wall plug valve is usually oil-sealed. The inlet valve is designed as a
vacuum safety valve that’s always open during procedure. The working chamber (5) is situated
inside the housing. Rotor and vanes divide the functioning chamber into two individual spaces having
adjustable volumes. As the rotor turns, gas flows into the enlarging suction chamber until it really is sealed
off by the next vane. The enclosed gas is compressed before outlet valve opens against
atmospheric pressure. Regarding gas ballast operation, a hole to the outside is opened, which
empties into the sealed suction chamber on leading side.
The Rotor moves with the help of a motor attached to it.
rotary vane pump
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