The present invention relates to a ventilator exhalation valve (10) for performing ventilation assisted to a patient at least partly by means of a device, said exhalation valve being locally axial, radial And a valve housing (14) having a flow path (16) extending along a passage trajectory (D1, D2) defining a circumferential direction, along which the respiratory air passes through the valve housing The valve housing (14) has a closed valve end structure (24) secured to the housing, with a closed end surface (24) surrounding the passage track (D1). The valve body (12) that is movable with respect to the valve housing (14) toward the valve partial structure has a mating surface (26) facing the end surface (24), Prete Pretensioning force is applied by the pretensioning force of the tensioning device (38), so that the mating surface (26) is against the pretensioning force of the pretensioning device (38) in the flow direction (E) of expiration. The end surface is expanded in the removal direction (A) of the annular gap (42) that can be formed or exist between the end surface (24) and the mating surface (26) by the inflow of breathing gas. (24) so that the flow path (16) can flow in the exhalation flow direction (E) and the flow path in a flow direction opposite to the exhalation flow direction (E). The flow through of (16) can be blocked by contact of the mating surface (26) of the valve body (12) with the end surface (24), and the valve body (12) is connected to an apron (44). The apron surrounds the mating surface (26) and the end surface (24) when the exhalation valve (10) is viewed in a reference state that is not loaded with normal respiratory flow. And extending in the circumferential direction, and projecting from the end surface (24) in the direction away from the mating surface (26) in the reference state, opposite to the removal direction (A), An annular gap space (46) is provided in the radial direction between the apron (44) and the end (22) having the end
