| 摘要 |
<p>PURPOSE:To prevent a valve main unit from tilting, by providing a cylindrical shaft part and a ring, guided along a bush provided in the periphery of said cylindrical shaft part, in a position lower than the opening part of the shaft part having the diametric direction opening part, in the case of a check valve equipped with a flow switch having a lead switch actuated by moving upward the valve main unit. CONSTITUTION:A device provides a magnet 26 in the point end of a valve guide 25 of a valve main unit 23 while a built-in lead switch 29, closed by approach of the magnet 26, in a base 28 opposed to the magnet 26. A cylindrical shaft part 23d, having a diametric direction opening part 23c, is mounted to the bottom part of the valve main unit 23, and a bush 21 is provided in the periphery of said cylindrical shaft part 23d so that the opening part 23c is blocked when the valve main unit 23 moves downward. A ring 23f of the same diameter to the cylindrical shaft part 23d, being formed in a part lower than the opening part 23c of the cylindrical shaft part 23d, prevents the valve main unit 23 from tilting by the cooperative action with the bush 21.</p> |
