| 摘要 |
<p>The apparatus is of the kind comprising a flow detector supplying, in the absence of flow, a stop down signal for the pump, a pressure detector supplying, for a predetermined minimum value of the pressure, a start up signal for the pump, and impeller means for the pressure detector, and is featured by the fact that the pressure detector comprises a movable part (1,2) which is integral with a membrane (3) closing a cavity (3b) communicating with the hydraulic network, and a fixed part (4,5) arranged in the apparatus body at the displacement position of the movable part (1,2), the impeller means for the movable part of the pressure detector are constituted of a spring (8) mounted between the said movable part (1,2) and the apparatus body (9), the flow detector comprising a part (6,7) which is movable in the vertical direction and performs the function of gravity closing valve, and a fixed part (4,5) which is arranged in the apparatus body.</p> |
