| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluctuating pressure absorber for drainage capable of securely suppressing fluctuation of pressure in a pipe without using a ventilation vertical pipe and a special drain joint to protect water sealing of a trap and preventing fluctuation of pressure in the pipe by only an indoor pipe without performing relief ventilation even in an indoor ventilation system using a vent valve to drain water smoothly. SOLUTION: A membrane tube 13 having smaller diameter than inside diameter of a cylindrical casing 11 is provided in the casing provided with a suction and exhaust port 14b in an upper part and a connection part 12 for connecting drain pipes in a lower part. An upper end part 13a of the membrane tube 13 is joined with the upper part of the casing 11 airtightly and a guiding body 15 moving vertically in the casing 11 is joined with a lower end part 13b airtightly to communicate the inside of the membrane tube 13 with outside air through the suction and exhaust port 14b. Holding rings 16 are provided at a predetermined interval at many steps along the direction of length of the membrane tube 13 to convert pressure acting in the centripetal and centrifugal direction into vertical movement by the membrane tube 13. COPYRIGHT: (C)2007,JPO&INPIT
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