| 摘要 |
A non-slam check valve is provided to safely and firmly prevent a slam by water by faithfully closing the auxiliary disk for opening and closing the main disk when a check valve is closed. A non-slam check valve includes a body, a rotational shaft(43), and a reverse flow hole opening/closing unit. In the non-slam check valve, a reverse flow hole(13) is gradually opened when a main disk is opened and is gradually closed when the main disk is closed by sliding the auxiliary disk along holes(21a) of guide plates(15a) provided in the main disk. When the main disk(11) is rotated together with a rotational shaft, the auxiliary disk(9) is rotated about a link arm(3) at the upper end of an inner wall of a passage provided at a position higher than the rotational shaft.
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