Improved on-off device for time-delay self-closing urinal flushing valve

The invention discloses an improved on-off device for a time-delay self-closing urinal flushing valve. The on-off device is arranged in a control channel of the urinal flushing valve, is controlled to open and close by a control device, and consists of a pair of ceramic disks matched in a sealing way; a ceramic fixed disk is fixed on a valve seat, and a ceramic moving disk is controlled to move in the control channel by the control device; the valve seat is provided with a threaded hole; a copper support ring fixes the ceramic fixed disk and is screwed in the threaded hole; and a seal ring isarranged between the ceramic fixed disk and the copper support ring for sealing and positioning. The whole on-off device is convenient to machine; the ceramic has the advantages of wear resistance and high temperature and low temperature resistance, so the service life of the on-off device is long; the on-off device can be applied to the condition of high water pressure or low water pressure; thenoise is small; and by the