The present invention relates to a pumping method in a pumping
system (SP, SPP) comprising: a primary lubricated rotary vane
vacuum pump (3) with a gas inlet port (2) connected to a
vacuum chamber (1) and a gas outlet port (4) leading into a conduit (5) before
coming out into the gas outlet (8) of the pumping
system (SP, SPP), a non-return valve (6) positioned in the conduit (5) between the gas outlet port (4) and the gas outlet (8), and an ejector (7) connected in parallel to the non-return valve (6). According to this method, the primary lubricated rotary vane
vacuum pump (3) is set into action in order to pump the gases contained in the
vacuum chamber (1) through the gas outlet port (4). Simultaneously the ejector (7) is fed with
working fluid, and the ejector (7) continues to be fed with
working fluid all the while that the primary lubricated rotary vane
vacuum pump (3) pumps the gases contained in the
vacuum chamber (1) and / or all the while that the primary lubricated rotary vane vacuum pump (3) maintains a defined pressure in the vacuum chamber (1). The present invention also relates to a pumping
system (SP, SPP) able to be used to implement this method.