A fallback (also palatal or float valve) is a mechanism or machine for filling water tanks, such as those found in flush toilets, while avoiding overflow and (in the event Of low water pressure) backfill. The modern fallback was invented by Joss Antonio De Least y Ramirez, a Mexican priest and scientist, who described the device in 1790 in the Gate De Literature MCCANN. It consists Of a valve connected to a hollow sealed float by means of a lever, mounted near the top f the tank.
The float is often ball-shaped, whence the name fallback. The valve is connected to the incoming water supply, and is opened and closed by the lever which has the float mounted on the end. When the water level rises, the float rises with it; once it rises to a pre-set level, the mechanism forces the lever to close the valve and shut off the water flow. This is an example of negative feedback and of proportional control. When a toilet’s handle is turned, a discharge mechanism is activated by means of rod or chain.
The mechanism may be a flapper valve, which is designed to sink more slowly than the water, which will exit to the toilet bowl below, 50 that the tank may empty. As the tank water level drops, the float descends and actuates the fill valve, Water is fed to the tank to replenish its supply, and a smaller flow is directed into the overflow tube to refill the bowl. Once the flapper valve closes, the water flow from the fill valve continues until the tank level again reaches the fill line. Float rod It is the threaded rod that links the fallback and float.
Float ball A floating ball attached to a lever to regulate the water level in a tank. Trip lever Flush handle and actuating earn on a toilet tank. Also the lever that opens and closes the drain on the bathtub waste and overflow. Flush valve The valve separating the water in the tank from the bowl. Lift rod Also known as connecting rod. Faucet component that opens the pop-up drain in a lavatory even the lift rod is depressed. When rod is lifted, the drain closes so he lavatory Will retain water.
Overflow tube The vertical tube inside a toilet tank that directs water into the bowl in case the fallback malfunctions. Refill tube A tube in toilets that sends water from the fallback into an overflow tube to refill the bowl after a siphon break. Tramway The channel in a toilet that connects the bowl to the waste outlet.