| 摘要 |
<p>Control device for a water filter comprising a hydraulic piston (22) in operative connection with a water intake chamber (23). Rising pressure in said chamber (23) as result of water flowing through said filter, results in displacement of the piston, which activates an elastic press switch (25). The press switch (25) closes an electric connection which activates an ultraviolet tube in the water filter. The water is forced out of said chamber through a narrow backflow hole (24) when water is not flowing through the filter. The time necessary to flow the water out of the chamber results in a delay in deactivation of the press switch. Thus, the water remaining in the filter is irradiated for a period after the water has stopped flowing.</p> |
