| 摘要 |
A valve comprising a valve body (1) and provided with a flow passage (3) into which a closure member (2) without a flow passage is rotatably fitted on a pivot shaft (8) and when necessary, sealing members (6) are positioned between the closure member (2) and the valve body (1). On one side or on both sides of the closure member (2) is fitted one or more punched attenuator plates (9) having a plurality of apertures (12), the plates (9) being spaced apart and parallel to each other and to the sealing surface of the closure member (2). |
