| 摘要 |
The invention relates to a shut-off device (1) and a process for producing a shut-off device with a housing (2) and a shut-off flap (3) that is pivotally located in the housing, a shut-off flap seat (7) formed by the components (2; 3; 8, 12a; 12b) being located between the housing (2) and the shut-off flap (3). To achieve the object of ensuring a good fit and thus a high level of tightness of the shut-off device, it is suggested according to the invention that the components (2; 3; 8, 12a; 12b) of the shut-off device (1) that form the shut-off flap seat (7) are subjected to treatment by cold ageing in the low temperature range. This treatment by cold ageing takes place advantageously before final mechanical working of the components (2; 3; 8, 12a; 12b) with liquid nitrogen.
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