| 摘要 |
A valve device comprises a valve housing (1) having an inlet (3), an outlet (4), and a flow passage (7) therebetween, a valve body (8) with a closure member in the form of a spherical calotte (9), at least one valve seat (6) in the valve housing, and attenuating means (20, 20', 20'') provided on the valve body within that space having the shape of a part of a shpere which is generated by the contour of the valve body when the valve body is turned about the axis of rotation by the rotatable shaft. The said attenuating means comprises first attenuating members (31-52) consisting of a plurality of attenuating rods, which extend in a longitudinal direction which is substantially parallel with said axis of rotation, that other members are provided to define second attenuating members (54-60) between parts (11) of the valve body which connect the rotatable shaft with the spherical calotte, that said second attenuating members together with said connecting parts (11) of the valve body and said spherical calotte form a basket which defines the contour of the attenuating means, and that the first attenuating members are substantially evenly distributed in and sparsely fill said basket. <IMAGE> |
