| 摘要 |
In the joint 40 for duplex pipes, a clearance between the first outer pipe seal unit 110 and the second outer pipe seal unit 210 is defined larger than a clearance existing between the first inner seal portion 120 and the second inner pipe unit 220. Furthermore, the wire diameter of the O-ring 301 which functions as the sealing member for the outer pipe is defined larger than the wire meter of the O-ring 401 which functions as the sealing member for the inner pipe. |
