| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a float type check valve capable of restraining deterioration of a backflow preventing function by reducing occurrence of damage to a float.SOLUTION: A float type check valve includes an annular valve seat, a float, a coil spring, and a regulating member. The annular valve seat is opened to a vertical direction, and communicates the upstream side with the downstream side of a drainage system. The float is positioned to be movable along the vertical direction in the downstream side under the annular valve seat, and is lifted in accordance with a rise of a water level of drainage, and is fitted to an opening, and closes the opening so as to close the annular valve seat, and is lowered in accordance with a descent of the water level of the drainage and releases the opening so as to open the annular valve seat. The coil spring is supported to expand and contract in the vertical direction, encloses the float, and guides the movement of the float in the vertical direction. The regulating member regulates a lower limit position of the movement of the float.</p> |
