Pressure medium supply installation (10.1, 10.2, 10.3, 10.4), in particular designed for selectively open, partially closed or closed operation, for the operation of a pneumatic installation which has an accumulator or similar pressure medium storage container and has a number of bellows or similar pressure medium chambers, having: - a charging arrangement (30.1, 30.2, 30.3, 30.4), which has a two-stage or multistage compressor; - a pressure medium feed, to which the charging arrangement (30.1, 30.2, 30.3, 30.4) having the two-stage or multistage compressor is connected on the pressure medium feed side, said compressor having at least a first and a second compressor stage (31.1, 31.2); - a pressure medium connection to the pneumatic installation (90.1, 90.2, 90.3, 90.4) and a venting connection to the surroundings, and also at least one pressure medium charging connection (1.1, 1.2) to the pneumatic installation, - a suction line on the suction side of the compressor between a suction connection to the surroundings and the compressor; - a compressor line between the first and second compressor stages (31.1, 31.2), - a pneumatic main line between the pressure medium feed and the pressure medium connection, - a venting line between the pressure medium feed and the venting connection, with a venting valve; - at least one pressure medium charging line (20.1, 20.2) between the at least one pressure medium charging connection (1.1, 1.2) and the compressor line; characterized in that the charging arrangement (30.1, 30.2, 30.3, 30.4) is designed for simultaneously guiding charged pressure medium (gDM) of the pressure medium storage container, or a pressure medium chamber, of the pneumatic installation (90.1, 90.2, 90.3, 90.4), which charged pressure medium is present at the at least one pressure medium charging connection (1.1, 1.2), in a manner dependent on the switching state of a first 2/2 directional charging valve, which belongs to the pressure medium supply installation and is able to be switched into two switching states, and further pressure medium (tDM), which is provided by the first compressor stage (31.1), to the second compressor stage (31.2). - a charging arrangement (30.1, 30.2, 30.3, 30.4), which has a two-stage or multistage compressor; - a pressure medium feed, to which the charging arrangement (30.1, 30.2, 30.3, 30.4) having the two-stage or multistage compressor is connected on the pressure medium feed side, said compressor having at least a first and a second compressor stage (31.1, 31.2); - a pressure medium connection to the pneumatic installation (90.1, 90.2, 90.3, 90.4) and a venting connection to the surroundings, and also at least one pressure medium charging connection (1.1, 1.2) to the pneumatic installation, - a suction line on the suction side of the compressor between a suction connection to the surroundings and the compressor; - a compressor line between the first and second compressor stages (31.1, 31.2), - a pneumatic main line between the pressure medium feed and the pressure medium connection, - a venting line between the pressure medium feed and the venting connection, with a venting valve; - at least one pressure medium charging line (20.1, 20.2) between the at least one pressure medium charging connection (1.1, 1.2) and the compressor line;