| 摘要 |
A valve assembly including a valve housing having a fluid passageway extending through it. The fluid passageway has an inlet portion having a cross-section defined by a substantially annular inlet surface, an outlet portion having a cross-section defined by a substantially annular outlet surface, and an inner chamber portion defined by a substantially annular inner chamber surface, an inner wall, and an outer wall. The inner wall extends inwardly from the inner chamber surface to the inlet surface, and the outer wall extends inwardly from the inner chamber surface to the outlet surface. The inner chamber portion is positioned between and adjacent to the inlet and outlet portions. A valve member is located within the inner chamber portion and is movable between a closed position in which the fluid passageway is blocked, and an open position in which the fluid passageway is not blocked. First and second substantially annular retainer ring assemblies are also located within the inner chamber portion, and rotatably position the valve member within the inner chamber portion. The first and second retainer ring assemblies provide first and second fluid seals between the valve member and the inner chamber surface at the first and second ends of the inner chamber portion respectively. The first and second retainer ring assemblies each include a floating retainer ring and a plurality of sealing members. The floating retainer rings are movable relative to the valve member, the inner chamber surface, and the inlet and outlet walls.
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