| 摘要 |
<p>PCT No. PCT/SE86/00190 Sec. 371 Date Dec. 23, 1986 Sec. 102(e) Date Dec. 23, 1986 PCT Filed Apr. 24, 1986 PCT Pub. No. WO86/06457 PCT Pub. Date Nov. 6, 1986.Apparatus for sensing and stopping large and small leakages between one or more tapping locations (6) and a stop valve (2) in a pressurized incoming pipeline (1) for preventing damage due to liquid leaving the line, e.g. water or oil, in buildings or other premises. The apparatus includes a pressure-and time-controlled regulating unit (4) intended for opening and closing the stop valve (2), which is normally closed when tapping does not take place but is opened but is opened when tapping is begun. The regulating unit (4) is connected to a pressure monitor (3), which is adapted for sensing the pressure after the stop valve (2) and giving the regulating unit an opening signal should the pressure fall below a given minimum pressure. Time control of the regulating unit is done with the aid of a series of time circuits (11, 15, 18, 22, 23, 24) arranged for registering different times (A, B, C, D, E) which start when the pressure monitor senses low pressure or one the termination of a preceding time. Control and calculating circuits are arranged for closing the stop valve (2) when previously determined times or time sequences are registered.</p> |
