| 摘要 |
<p>PURPOSE:To enable a flow amount to be easily detected with no increase of piping resistance of a supply water pipe, by detecting the displacement of a valve unit in a pump suction valve so as to catch the flow amount. CONSTITUTION:If a pump is driven, a check valve chamber 20b, generating a negative pressure, attracts water through a small gap A between a cylindrical part 23d of a valve main unit 23 and a bush 21, and the valve main unit 23 starts its displacement to the upper with a packing 24. If the valve main unit 23 moves upward to a fixed distance, a magnet 26, mounted to the point end of a valve guide 25, approaches a reed switch 29 mounted to inside a base 28. In this way, the reed switch 29 is turned on, and if said reed switch 29 s observed, it can be detected that an opening of the valve main unit 23, that is, a suction amount of the pump reaches a predetermined value.</p> |
