A dosing device includes a gas flow channel and a dosing chamber.The dosing chamber is positionable in a region of the gas flowchannel. Arelease mechanism has a separating element which isdisplaceable between closed and open positions. Inthe closedposition, at least one or both of the gas flow channel and aconnection between the gas flow channel and the dosing chamber isblocked. Inthe open position, at least one or both of the gasflow channel and the connection between the gas flow channel andthe dosing chamber is released. Thedevice has a slide guideelement on which the separating element is displaceable between theclosed and open positions and on which the separating element isdrivable. Atleast one of or both of the separating element andthe slide guide element is in a sliding contact region with a slideelement.
