| 摘要 |
A back pumping seal assembly includes a buffer seal and a backup ring. The buffer seal has inner, outer, front, and back seal faces. The buffer seal further has a contoured face portion inset and extending inwardly from the inner and back seal faces. The contoured face defines a back seal channel. The backup ring is positioned in the back seal channel of the buffer seal. The backup ring includes inner and back ring faces, and at least two channel-directed faces. The inner and back ring faces are adjacent the inner and back seal faces, respectively. A first channel-directed face extends from the inner ring face substantially parallel to the back ring face. The first channel-directed face is configured for limiting displacement of an adjacent portion of the buffer seal. A second channel-directed face extends from the back ring face at an acute angle relative thereto.
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