| 摘要 |
<p>A filter device comprises a central tube (2), a housing (4) enclosing the central tube (2) and defining an internal chamber (6) therewith, and a filter body (8) within the internal chamber (6). The central tube (2) includes a plug (10) between the inlet (2a) and outlet (2b) which directs the fluid to flow from the inlet (2a) through the filter body (8) and out through the outlet (2b). The housing (4) and filter body (8) are mounted for sliding movement axially of the central tube (2) from a normal filtering position wherein the housing inlet (14) communicates with the upstream side of the filter body (8), to a back-flushing position wherein the inlet (14) communicates with the downstream side of at least a portion of the filter body (8). The housing (4) may also include a valve member (32) moved therewith under differential pressure between the housing inlet (14) and outlet (16) to regulate the pres sure at the outlet (16).</p> |
