Flap valve arrangement

The invention proposes a flap valve arrangement (10) comprising a valve flap (14) pivotally mounted in a passage (12), wherein said valve flap (14) is rotatable about an axis of rotation (20), wherein said valve flap (14) comprises at least one free end (22, 24), and wherein said passage (12) comprises at least one remote wall (30, 32) facing said at least one free end (22, 24) of the flap (14), characterised in said at least one free end (22, 24) of the flap (14) is curved or curveable against the direction of a closing motion of the flap (14) and said at least one free end (22, 24) of the valve flap (14) is provided to engage the remote wall (30, 32) in a partially at least substantially straight section.