Abstract: A leaf seal assembly provides a fluidic seal between a first and second member and includes first and second cover plates defining a channel, with a first and second edge, respectively. A plurality of leaf elements are located within the channel, each element having first and second edges adjacent to the first and second cover plates, respectively and a projecting portion of each element extends beyond both edges. A fluid flow in a first direction causes the leaf elements to move away from the first member to create a fluid passage between the elements and the member, allowing a flow through the seal in the first direction; and a fluid flow in a second direction causes the leaf elements to move towards the first member such that a third edge of the projecting portion of each element contacts the member, opposing the flow through the seal in the second direction.