| 摘要 |
PROBLEM TO BE SOLVED: To provide drainage piping in which drain water can be prevented from being residual in piping by using the same auto-sealing device regardless of vertical piping or horizontal piping and by surely operating the auto-sealing device.SOLUTION: Drainage piping 1 is composed of an eccentric pipe 2, an auto-sealing device 10 and a check valve 20. The eccentric pipe 2 is a pipe body composed of an upstream part 3, an eccentric part 4 and a downstream part 5, and is a combination pipe which is available to both vertical piping and horizontal piping having the check valve 20 to which the auto-sealing device 10 is mounted. The auto-sealing device 10 is fixed while being inclined with respect to an axial direction of the upstream part 3, and deflects a drain flow passage. A flow passage forming section 23 provided in the check valve 20 has a diameter approximately equal to that of the upstream part 3 and, when the check valve 20 is fixed, is continued on the same surface as the upstream part 3, thereby preventing drain water from being residual when the drainage piping 1 is used as horizontal piping. |
