| 摘要 |
An apparatus is disclosed for controlling the flow of a hot fluid. The apparatus includes a closure member for sliding between a closed position and an open position. The closure member has a hot section defined by the portion of the closure which is subject to impingement of hot fluid when the closure member is in the closed position and a cold section disposed outside the fluid passageway and not subject to impingement of hot fluids. The cold section includes at least one cleft which facilitates expansion of the cold section in response to expansion of the hot section due to heating by impingement of hot fluid on the hot section. This, in turn, relieves stresses and reduces the extent of distortion of the closure member.
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