Drain valve device, cleaning water tank device equipped with this drain valve device, and washing toilet bowl equipped with this washing water tank device

摘要

PROBLEM TO BE SOLVED: To provide a drain valve device capable of improving installing performance, restraining variance in an amount of washing water and occurrence of wasteful water, and saving water.SOLUTION: A drain valve device 8 includes: a body part 18 having a drain port part 14 attached to a drain port 6b formed on a washing water tank 6, and a valve element 38 for opening and closing the drain port part 14; and a cylindrical body 20 attached to the body part 18 and freely selectable in accordance with the specification of the washing water tank 6. The cylindrical body 20 includes a lower opening part 46 attached to the drain port part 14 of the body part 18 attached to the washing water tank 6, and a side wall part 50 protruding to an outer peripheral side from the lower opening part 46 and then surrounding the body part 18, and intrusion preventing means for preventing washing water outside the cylindrical body 20 from intruding into the cylindrical body 20 through an attachment part 54 is formed on the attachment part 54 of the cylindrical body 20 attached to the body part 18.SELECTED DRAWING: Figure 4