Flushing assembly, water supply assembly, lower position water suction assembly, water tank, check valve for use in a toilet, and method, device, and storage medium for controlling toilet water consumption

A toilet, comprising:

• a vacuum breaker;
• a check valve configured to be mounted downstream from the vacuum breaker, the check valve comprising:
• a lower sealing element;
• an upper sealing element comprising a flexible part configured to seal the lower sealing element;
• and
• a supporting element comprising a plurality of hollow parts, and the supporting element configured to be mounted in the lower sealing element and mounted at a side where clean water flows into the lower sealing element.

A method for supplying clean water to a tank of a toilet by using a check valve, the method comprising:

• deforming, by clean water flowing in a first direction, a flexible part of an upper sealing element of the check valve to unseal a lower sealing element so as to allow the clean water to pass through the lower sealing element;
• delivering, by the check valve, the clean water passing through the lower sealing element to the tank;
• and
• pressing, by contaminated water flowing in a second direction opposite to the first direction, the flexible part towards the lower sealing element to seal the lower sealing element.