Seat ring for butterfly valve, its fixing structure and eccentric butterfly valve

摘要

Simplify the structure while ensuring adequate seal surface pressure between the valve body and seat ring during sealing to improve durability and maintain excellent operability. However, the present invention provides a butterfly valve seat ring, a fixing structure thereof, and an eccentric butterfly valve that can ensure a sealing surface pressure, exhibit high sealing performance, and can reliably seal back leakage. A flexible portion 31 having a predetermined thickness is provided on one side surface of the inner diameter of the ring-shaped base portion 30 having a substantially rectangular cross section, and a fixing portion 32 is integrally extended on one side surface of the outer diameter of the base portion 30. A concave space portion 40 is provided between the outer peripheral surface 36 of the flexible portion 31 and the inner peripheral surface 37 of the fixed portion 32, and a seal contact portion 35 is projected from the inner diameter position of the flexible portion 31. By the butterfly valve seat ring in which the portion 35 is positioned on the inner peripheral surface of the flexible portion 31 from the back side position 42 of the space portion 40.