Abstract: A drain valve device and a drain valve for a cleaning water tank are disclosed. A drain valve device for a cleaning water tank which stores a cleaning water for cleaning a toilet bowl, comprises a drain valve main body including a supporting shaft extending in a horizontal direction and a valve seat attached to a draining port formed at a bottom surface of the cleaning water tank, and a drain valve including an engaging portion which engages with the supporting shaft and is capable of swinging in a vertical direction, and a valve body, connected with the engaging portion through an extending portion, for carrying out a water discharge and a water stop when contacting with or separating from the valve seat by swinging in a vertical direction.

Abstract: A drain valve device and a drain valve for a cleaning water tank are disclosed. A drain valve device for a cleaning water tank which stores a cleaning water for cleaning a toilet bowl, comprises a drain valve main body including a supporting shaft extending in a horizontal direction and a valve seat attached to a draining port formed at a bottom surface of the cleaning water tank, and a drain valve including an engaging portion which engages with the supporting shaft and is capable of swinging in a vertical direction, and a valve body, connected with the engaging portion through an extending portion, for carrying out a water discharge and a water stop when contacting with or separating from the valve seat by swinging in a vertical direction.

Abstract: The present invention provides a toilet bowl flushing water tank device which can prevent the easy increase of a supply quantity of flushing water to a toilet bowl exceeding a predetermined quantity.

Abstract: A toilet 10 has a bowl 20, a connection pathway 31, an ascending pathway 32, and a descending pathway 33 across a weir 34. The descending pathway 33 includes an expanded section 33a having a greater pipeline diameter and a tapered end 33b having a narrower opening area than that of the expanded section 33a, and is connected with a drain socket 70. The drain socket 70 has an inner drain conduit socket member 72 that is attached to be located inside a drain conduit 90. The inner drain conduit socket member 72 has an extended socket section 75, which is located below a floor surface FL of a lavatory and has a greater pipeline diameter, and a tapered conduit section 76, which has a narrowed diameter. These sections 75 and 76 constitute a siphon action induction module.

Abstract: A toilet 10 has a bowl 20, a connection pathway 31, an ascending pathway 32, and a descending pathway 33 across a weir 34. The descending pathway 33 includes an expanded section 33a having a greater pipeline diameter and a tapered end 33b having a narrower opening area than that of the expanded section 33a, and is connected with a drain socket 70. The drain socket 70 has an inner drain conduit socket member 72 that is attached to be located inside a drain conduit 90. The inner drain conduit socket member 72 has an extended socket section 75, which is located below a floor surface FL of a lavatory and has a greater pipeline diameter, and a tapered conduit section 76, which has a narrowed diameter. These sections 75 and 76 constitute a siphon action induction module.