| 摘要 |
<p>A unit for discharging loose material from a dispensing device (2) to a user unit (4) comprises a discharge tube (5) leading to the user unit (4) and a valve element (6) connecting the dispensing device (2) to the infeed end of the tube (5). The valve element (4) comprises a first annular element (7) equipped with a shutter device (9), consisting of a first shutoff element (13) and a second shutoff element (14) connected to each other by permanent magnets (16), and a second annular element (8) connected to the infeed end of the tube. When the first and second annular elements (7, 8) are separated by the operation of pistons (31), a gap (36) is created between the two shutoff elements (13, 14). A pair of concentric seals (26, 27) positioned between the first and the second annular elements (7, 8) isolate the gap (36) from the outside environment so that a cleaning fluid can be made to flow into it. <IMAGE></p> |
