The vacuum pump is intended for the suction of air and other dry,non-aggressive ,non-toxic and non-explosive gases. Conveying media with a higher density than air leads to an increased thermal and mechanical load on the vacuum pump and is permissible only after prior consultation. Permissible temperature range of the inlet gas: see ”Oil”,”Ambient temperature range” In case the vacuum pump is equipped with a gas ballast (optional) water vapor within the gas flow can be tolerated within certain limits. The conveyance of other vapors shall be agreed upon. The vacuum pump is intended for the placement in a non-potentially explosive environment. Version with float valve (j) and oil return line; The vacuum pump is thermally suitable for continuous operation. Version with oil return valve (h); The vacuum pump is thermally suitable for continuous operation. The vacuum pump is ultimate pressure proof.

The vacuum pump works on the rotating vane principle. A circular rotor(s) is positioned centrally on the shaft of the vacuum pump. The shaft of the vacuum pump is driven by the drive motor shaft by means of a flexible coupling. The rotor (s) is rotates in an also circular, fixed cylinder (t),the center line of which is offset from the center line of the rotor such that the rotor and the inner wall of the cylinder almost touch along a line. Vanes(f),sliding in slots in the rotor, separate the space between the rotor and the cylinder into chambers. At any time gas is sucked in and at almost any time ejected.Therefore the vacuum pump works almost pulsation free. In order to avoid the suction of solids, the vacuum pump is equipped with a screen in the suction connection.In order to avoid reverse rotation after switching off, the vacuum pump is equipped with a Non-return valve. Note: This valve shall not be used as a non-return valve or shut-off valve to the vacuum system and is no reliable means to prevent suction of oil into the vacuum system while the vacuum pump is shut down. In case the vacuum pump is equipped with a gas ballast (optional): Through the gas ballast valve a small amount of ambient air is sucked into the pump chamber and compressed together with the process gas. This counteracts the accumulation of condensates from the process gas inside the vacuum pump. The gas ballast line is equipped with a paper filter. Gas ballast version with ball valve; The gas ballast line can be closed partially or completely by means of a ball valve. In order to improve the operating characteristics the outlet of the pump chamber is equipped with a spring loaded valve (q).