| 摘要 |
PROBLEM TO BE SOLVED: To provide a piping structure that comprises a check valve on the downstream side of a drain trap and prevents a discomfort whistling-like sound from being generated while preventing seal water's decrease based on negative pressure generated in a drain flow passage.SOLUTION: A piping member, a member for connecting drain water generated in equipment with piping on the sewage side, includes: a water seal type drain trap 8; a check valve 1; and an intake valve 3. The intake valve 3 is disposed on a second bent part 8d's top face and opens when a space R between a water surface on the seal water's downstream side and the check valve 1 has had negative pressure, to supply ambient air to the inside of piping on the downstream side before eliminating the negative pressure in the space R.SELECTED DRAWING: Figure 1 |
