| 摘要 |
Device making it possible to protect the water inside water towers against all atmospheric pollution of nuclear, biological and chemical origin. This device operates automatically and without energy merely by changing the water level in the water towers. It consists of a filter body (1) in which is placed an active-carbon filter (2) through which flows the air (7) automatically drawn in at the time of the water consumption. An air outlet (10) provided with a nonreturn delivery valve (11) operates automatically at the time when the water tower is being filled and by virtue of the nonreturn valve (8) situated at the filter outlet (2). For operation during a period when there is no pollution an aeration (13) operating freely is provided, but is equipped with a valve (15) for enabling the filtration to be stopped or brought into service. <IMAGE>
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