Filter device and method for mounting such a filter device

A filter device for the separation of impurities from a gas,

• whereby the filter device includes a filter housing including a lid and a pot, the pot having a longitudinal axis extending longitudinally with respect thereto, the filter device further including fixing means for fixing the lid to the pot,
• whereby a filter element is installed in the pot, which filter element includes a top cap and a bottom cap with a filter cartridge in between,
• whereby the lid is provided with an inlet for gas to be purified and an outlet for purified gas,
• whereby the top cap is provided with an inlet duct that will lead gas to be purified to the filter cartridge, whereby, when the pot is mounted on the lid, an entrance of the inlet duct connects to the inlet of the lid and between the lid and the top cap is a space that is connected to the outlet of the lid,
• wherein the filter device is provided with positioning means configured to rotatably position the top cap in relation to the lid when mounting the pot on the lid, and with pressure means configured to press the entrance of the inlet duct against the inlet of the lid after mounting the pot on the lid,
• whereby the positioning means and the pressure means are configured such that the positioning means come into action earlier than the pressure means during the rotatable mounting of the pot on the lid about said longitudinal axis, and
• whereby the filter pot is configured such that initially the pot is capable of being rotated about said longitudinal axis with respect to the lid until the top cap is rotatably positionally fixed with respect to the lid by the positioning means and thereafter the pot is capable of being further rotated about said longitudinal axis with respect to the lid so that the top cap is urged further into the lid until the pressure means presses the entrance of the inlet duct against the inlet of the lid to create a seal therebetween.