| 摘要 |
A valve unit (1) for selectively cutting off two fluid streams, in particular the inlet and exhaust streams of an internal combustion engine cylinder, and having a body (2) in which are formed a first and a second channel (4, 5), both communicating with the same sealing seat (6) for a single shutter (7); the shutter (7) has a sealing surface (8) cooperating in fluidtight manner with the sealing seat (6), and is housed in rotary manner inside said sealing seat (6), so as to rotate reciprocatingly to selectively and alternately open-close the first channel (4) and the second channel (5). |
