An exhalation valve arrangement (10) for a ventilator apparatus for the artificial respiration of patients can be flowed through in an exhalation flow direction (E) and comprises: - an upstream breathing gas duct (14), which extends along a first duct path (20), - a downstream breathing gas duct (16), which extends along a second duct path (34), and - a valve assembly (26) having a valve body (24) and a valve seat (22), which valve assembly is provided such that, in the event of a predetermined first breathing gas overpressure in the upstream breathing gas duct (14) relative to the downstream breathing gas duct (16), said valve assembly permits an exhalatory breathing gas flow from the upstream breathing gas duct (14) to the downstream breathing gas duct (16) and, in the event of a predetermined second breathing gas overpressure in the downstream breathing gas duct (16) relative to the upstream breathing gas duct (14) said valve assembly blocks a gas flow from the downstream breathing gas duct (16) to the upstream breathing gas duct (14). In the downstream breathing gas duct (16), a flow resistance formation (38) is provided radially inside the duct wall (30a) that limits the downstream breathing gas duct (16) radially outwardly, which duct wall reduces the flow cross-section of the downstream breathing gas duct (16), compared to the same downstream breathing gas duct (16) without a flow resistance formation (38), said reduction taking place at the location where the flow resistance formation is arranged. According to the invention, the flow resistance formation (38) subdivides the cross-section that can be flowed through of the downstream breathing gas duct (16) into no more than five structurally separate partial cross-sections and/or the flow resistance formation (38) reduces the cross-section that can be flowed through of the downstream breathing gas duct (16) along the second duct path (34) over a length of no less than 5 mm.
