Time adjustable self-closing water saving device

The utility model is suitable for manufacturing all water faucets for daily use, closet flushing valves, shower valves, etc. The utility model is composed of a button, a time regulating screw bolt, a middle seat, a cylinder cap, a cylinder, a piston, etc. The utility model can be turned on and turned off in a straight line lifting way, and therefore, a sealing surface without friction and abrasion can hold water. The utility model has multiple types, such as a press self-closing type, a foot pedal self-closing type and a manual closing type. The time-delay self-closing time can be adjusted by users. When the time of using water is short, only a press or a tread on the button is needed, and the product is automatically turned off after the setup time is over. When the time of using water is long, the button is pressed with backward rotation, and the utility model is self-closed after use by forward rotating the button. Not only cold water and hot water but also the mixing of cold water and hot water can be realized with two sets of devices mounted on one product. Moreover, the self-closing function can effectively prevent washed hands from cross-infection for a second time. The utility model has the advantages of water saving, sanitation, convenience, fashion and long service life.