| 摘要 |
PCT No. PCT/FI96/00300 Sec. 371 Date Dec. 5, 1997 Sec. 102(e) Date Dec. 5, 1997 PCT Filed May 28, 1996 PCT Pub. No. WO96/39240 PCT Pub. Date Dec. 12, 1996A twin filter for compressed air, in which there are two filters set in parallel and an arrangement of valves to direct compressed air through a selected filter. The arrangement of valves includes inlet valves to distribute compressed air from the inlet to the selected filter and an arrangement of counter-valves to direct the compressed air from the selected filter to the compressed air outlet. The arrangement of counter-valves includes a ball chamber formed in the housing structure, at the ends of which are inlet connections and an outlet connection in the center. A ball is arranged to close that inlet connection in which there is no pressure. The ball chamber has a filter element in the central area of which a ring-like outlet channel is formed, which collects the outlet flow to the outlet connection.
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