| 摘要 |
<p>To achieve the above purpose, the present invention provides a butterfly valve comprising: a valve body having a through-hole formed thereon; a seat part in a shape of a ring arranged on an inner circumference surface of the valve body; a circular disk to open and close the through-hole; and a pressurizing unit including a first elastic part having one end arranged and fixated between the valve body and the seat part and having an other end pressurizing the disk as a free end, a second elastic part having one end fixated to the seat having the other end pressurizing an inner surface of the free end of the first elastic part towards the disk as a free end, and a backup ring arranged between the first elastic part and the second elastic part.</p> |
