A dual flush device comprises a mounting structure and a float to retrofit single flush toilets to dual flush toilets. The mounting structure is attached to an overflow tube and connected to the float with a vertical bar along which the float can move vertically downward or upward with the water level in the toilet tank. The float includes a water-tight container and a bottom part screwed into the bottom of the container. The vertical length of the float is adjustable by rotating the bottom part either away or toward the container. Several embodiments of the mounting structure and float are invented to accommodate various toilet models. The dual flush device operates with a flapper valve and a single flush handle assembly and maintains the modular design of conventional toilets. The float will prematurely close the flapper valve in a partial flush using less water than in a full flush.

A toilet flapper valve dual flush system provides a choice of flush durations using flapper valve with a vented buoyancy chamber and an operating system that lifts the flapper valve from a vented side, rather than the center, to provide a simple effective control of the volume of water used.

A toilet tank structure is formed by a primary-secondary water tank set, a tap water inlet control valve, a secondary water tank inlet control valve and a flush control module, and the tap water inlet control valve, the secondary water tank inlet control valve and the flush control module are provided for controlling the flushing and water supply to minimize the waste of water resources effectively, so as to achieve the effects of saving water and improving functionality.

A toilet pan is provided with a water replenishing device for flush rim with silence function. The water replenishing device has independent drainage from the drainage of the cisterns. The water replenishing device includes a water storage box with a water inlet on top side and a drainage outlet on bottom side. The drainage outlet is connected to the waterway for flush rim. A lid is installed in the water storage box to open or close the drainage outlet. The water storage box is provided with a water storage area. A back flow channel has one end connected to the water inlet and the other end extending into the water storage area below or equal to the highest level of the water storage area. Such toilet makes less noise by eliminating water inlet noise.

A multi-stage toilet flush valve includes an inner valve and an outer valve that circumstribes the inner valve. The inner and outer valve control the flow of flushwater through associated inner and outer outlets. Thus, when the flush valve is actuated, the inner and outer valves are actuated at separate times, while the inner valve delivers flushwater to a rim of the toilet, while the outer valve delivers flushwater to a jet feed outlet in the toilet. As such the multi-stage toilet valve provides two independent inner and outer flushwater delivery outlets that are controlled by associated inner and outer valves that are capable of being actuated at separate times to control the ratio of flushwater delivered to a toilet rim and to a toilet jet feed outlet to enhance the effectiveness in which the toilet bowl is cleaned.

A timed pressure equalization member for use in a siphonic toilet to reduce water loss at the end of a flush cycle is disclosed. The equalization member functions to equalize the pressure in a pressurized chamber after a set period of time and consequently alleviates negative pressure within a pressurized trapway system at or near the end of a flushing cycle via a conduit, to help break the siphon at the end of the flush cycle, thereby reducing the amount of water drained from the water bowl/spot while the bowl is being refilled. At a resting state, the equalization member in the pressurized chamber is partially filled with water. The equalization member empties of water after a set period of time during a flush cycle and allows atmospheric air to enter the pressurized chamber (in fluid communication with the pressurized trapway) at or near the end of the flush cycle.

A flapper assembly for a flush valve as well as method of assembly are provided. The flapper assembly includes a frame and multiple buoyancy assemblies attachable to the frame so as to adjust the buoyancy of the flapper assembly. The flapper assembly kit may have adjustable legs attachable to the frame. The flapper assembly kit may have multiple seal members for use in sealing with different sized/shaped valve seats of different sized flush valves.

A flapper assembly for a flush valve as well as method of assembly are provided. The flapper assembly includes a frame and multiple buoyancy assemblies attachable to the frame so as to adjust the buoyancy of the flapper assembly. The flapper assembly kit may have adjustable legs attachable to the frame. The flapper assembly kit may have multiple seal members for use in sealing with different sized/shaped valve seats of different sized flush valves.