| 摘要 |
<p>A sliding valve or fluid distributing device, for pneumatic circuits, of the type comprising a central distributing chamber (2) connected with a fluid inlet (3) and, respectively, fluid outlets (4, 5) by means of lateral chambers (6, 7) axially aligned with the central chamber (2); and a poppet spool (17) sliding in the aforesaid chambers (2, 6, 7), which is provided with a fluid control unit (16) in the aforesaid lateral chambers (6, 7). Each fluid control unit (16) comprises a first poppet element (22) designed to close against a valve seat (12) communicating with the distributing chamber (2) and a second poppet element (24) opposite the first comprising a flexible annular seal designed to close against a flat valve seat (14), communicating with a discharge chamber (8) to automatically compensate for wear and any variations in the working strokes of the two flow control units (16).</p> |
