| 摘要 |
<p>A hollow distributor arm (200) for a water filtration plant (e.g. a percolating filter) has a series of jets (204) disposed along the arm to deliver liquid (to be filtered) from within the arm on to the filter bed (202). To prevent the jets blocking, plungers (210) are mounted on the arm (one plunger for each jet) by support members (207), and are periodically moved into their respective jets to clear obstructions therein. Each support member has a region of flexure defining an axis about which the plunger pivots. Conveniently, the support member is fixed to the arm at the jet itself. Preferably, the support member 207 is a strap moulded integrally with a body portion 209 from which the plunger projects. <IMAGE></p> |
