| 摘要 |
<p>In accordance with the present application, a fluid seal (30) and fluid sealing element (32), which are tolerant of fluid F direction reversals are provided. A sealing element (32) has at least two brush stages (50) to restrict leakage of the fluid F through a gap (38) between a component and a sealing surface (36). Each brush stage (50) includes a bristle arrangement (44) sandwiched between a back plate (48) and a common mid plate (46). A valve (70) allows the fluid F to bypass a bristle arrangement (44) if the fluid pressure P1 or P2 varies between the chambers (40, 42). Permanent damage to the sealing element (32) is avoided by allowing the higher pressure fluid F to bypass the upstream bristle arrangement (44) and properly load the downstream bristle arrangement against a back plate (48).</p> |
