| 摘要 |
[Problem] To provide a structure and method for fixing a ball seat for a ball valve suitable for high-pressure fluid, ensuring sealing and slidability through a seal created by a soft seat, the ball seat being held in a retainer even when an ultra-high-pressure fluid flows through, preventing positional misalignment and detachment, and maintaining a strong seal when the valve is closed. [Solution] In order to solve this problem, the present invention is a structure and method for fixing a ball seat for a ball valve, a trunnion-type ball valve (100), and a hydrogen station that uses this valve, in which a stepped part (30) is provided in the middle between the inner and outer peripheral surfaces of a resinous annular seat body (21), a seat part (31) is provided to the tip-end side, a holding part (32) is provided to the rear-end side, a fitting groove (45) comprising inner and outer tubes having a ring-shaped crimped edge (34) is formed in the tip end of a seat retainer (22), the holding part (32) is fitted into the fitting groove (45), the crimped edge (34) of the inner and outer tubes is firmly secured by crimping to the stepped part (30), and the seat part (31) protrudes past the crimped position. |
