| 摘要 |
A 5/2-way commutating valve, particularly for reverse-flush filters in water treatment plants, consists of a tubular housing with five radial pipe connections (6, 9, 10, 11, 12), between which a valve seat (24 to 27) is present in each case. Preferably spherical valve elements (28 to 30) are arranged on a central rod (23) stressed in one direction by a spring arrangement (32), a double-sided value element (29) cooperating with the two central valve seats (25, 26) being slidable longitudinally relative to the central rod (23). The housing is composed of a plurality of mutually rotatable housing parts (16 to 20) each exhibiting a pipe connection. A flow throttle (51, 23) installed between the spigots (9 and 12) in the housing serves to adjust the flow velocity during reverse flushing. A compressed air piston, which is connectable to the compressor of a ozone generator, may be provided to actuate the central rod (23) counter to the spring arrangement (32).
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