A manual override device for a flush assembly includes an override valve, an override chamber, and at least one input device. The override chamber includes a first fluid connection to a first side of a piston in a flush valve assembly and a second fluid connection to a second side of the piston in the flush valve assembly. The input device is coupled to the override valve and configured to initiate evacuation of fluid from the first side of the piston when the input device is actuated to begin a flush cycle in the flush valve assembly by way of movement of the piston.

A manual override device for a flush assembly includes an override valve, an override chamber, and at least one input device. The override chamber includes a first fluid connection to a first side of a piston in a flush valve assembly and a second fluid connection to a second side of the piston in the flush valve assembly. The input device is coupled to the override valve and configured to initiate evacuation of fluid from the first side of the piston when the input device is actuated to begin a flush cycle in the flush valve assembly by way of movement of the piston.

A main valve seat surface for engaging the piston, an outer sidewall, and an inner sidewall defining a flow passage with a first opening and an second opening, the flow passage having a reduced diameter portion.

A main valve seat surface for engaging the piston, an outer sidewall, and an inner sidewall defining a flow passage with a first opening and an second opening, the flow passage having a reduced diameter portion.

A draining and flushing mechanism comprises a tank body, a first piston, a fixation rod to assemble the first piston, a main energy-storage spring and a drainage valve; the first piston is assembled inside the tank body and divided the tank body into a top tank and a bottom tank; the bottom tank is a water storage room spaced by the first piston and the tank body at the lower portion of the tank body; the main energy-storage spring is attached to the first piston to push the first piston to the bottom tank; an inlet pipe is connected to the bottom tank; wherein the bottom surface of the bottom tank is disposed with an assembly hole, the drainage valve is connected to the assembly hole and assembled to the outer side of the bottom tank, the drainage valve is disposed with at least a drainage hole.

A draining and flushing mechanism comprises a tank body, a first piston, a fixation rod to assemble the first piston, a main energy-storage spring and a drainage valve; the first piston is assembled inside the tank body and divided the tank body into a top tank and a bottom tank; the bottom tank is a water storage room spaced by the first piston and the tank body at the lower portion of the tank body; the main energy-storage spring is attached to the first piston to push the first piston to the bottom tank; an inlet pipe is connected to the bottom tank; wherein the bottom surface of the bottom tank is disposed with an assembly hole, the drainage valve is connected to the assembly hole and assembled to the outer side of the bottom tank, the drainage valve is disposed with at least a drainage hole.

A rigid piston assembly for use in a conventional flush valve includes a rigid piston configured to fixedly engage within the valve body. The present invention is also directed to a flush valve for a plumbing fixture as well as a method of retrofitting a rigid piston into a diaphragm flush valve body.

A rigid piston assembly for use in a conventional flush valve includes a rigid piston configured to fixedly engage within the valve body. The present invention is also directed to a flush valve for a plumbing fixture as well as a method of retrofitting a rigid piston into a diaphragm flush valve body.

A rigid piston assembly for use in a conventional flush valve includes a rigid piston and a solenoid configured to fixedly engage within the valve body. A flush valve for a plumbing fixture as well as a method of retrofitting a piston valve into a diaphragm flush valve body which includes a rigid piston and solenoid configuration.

A rigid piston assembly for use in a conventional flush valve includes a rigid piston and a solenoid configured to fixedly engage within the valve body. A flush valve for a plumbing fixture as well as a method of retrofitting a piston valve into a diaphragm flush valve body which includes a rigid piston and solenoid configuration.