| 摘要 |
PROBLEM TO BE SOLVED: To prevent the seal destruction of traps for various drain facilities by the generation of negative pressure in a header in a drainage system for a residence in which drain from various drainage facilities is collected to the header and drained to a sewer main through a drain main pipe, a drainage basin, the drain main pipe and a public inlet from the header. SOLUTION: The header 8 and the drain main pipe 3 are connected vertically eccentrically through a 90 deg. elbow joint 31 and a short pipe 32, and a vent valve 91 communicated with atmospheric air at all times is installed to the 90 deg. elbow joint 31 connected to the header 8.
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