| 摘要 |
<p>A pressure relief valve particularly for use in an aircraft undercarriage damping system, includes a fluid flow channel (6, 19, 21) through which an initial flow of fluid passes in use, and a member (23) responsive at a predetermined fluid pressure to lift a valve closure member (13) from a seat (19a), allowing an additional fluid flow from the inlet (6) of the flow channel to outlets (7, 8). The pressure responsive member (23) is located substantially centrally in the fluid flow channel (6, 19, 21). Part of the flow channel (21) is formed by part of the valve member (13). The pressure responsive member (23) and flow channel (21) are elongated and parallel. Screen means (4) on the valve screens the outlet end of the channel (21) from the fluid inlet port (6), reducing turbulence in the channel. The valve is opened by the combined effect of pressure acting on the members (23, 13) and the drag induced by flow along the channel (6, 19, 21). Lands (14, 15) on the member (13) control flow through the outlets (7, 8) respectively. <IMAGE></p> |
