09-05-2018 дата публикации
Номер: KR101856428B1
The present invention relates to a rubber-seated butterfly valve. A rubber sheet (2) is mounted on an inner circumferential wall of a valve body (1), and a stem (4) of a disk (3) rotating while being closely placed therewith is fitted into a shaft hole (5) of the rubber sheet (2) and an axial groove (6) of the valve body (1). Both side inclined parts (10), each of which is inclined in a shape in which an inner diameter decreases toward the center, are formed on the inner circumferential surface the rubber sheet (2), and concave round parts (20, 20c, 20d), each of which has a concave shape with a predetermined curvature, are formed between the both side inclined parts (10). In the disk (3), convex round parts (30, 30a), each of which has an outer circumferential surface having a convex shape with a predetermined curvature on a cross section, are formed. The convex round parts (30, 30a) have a predetermined curvature ratio with respect to the concave round parts (20, 20c, 20d), and the curvature ...
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