How many valves are typically present in a toilet flush tank?

In a toilet flush tank, there are typically two valves present, which play crucial roles in the flushing mechanism. The first valve is the fill valve, also known as the ballcock, which controls the water supply that refills the tank after each flush. It opens to allow water to flow into the tank until it reaches a certain level, at which point it closes to stop the flow.

The second valve is the flush valve, which is responsible for releasing water from the tank into the toilet bowl when the flush handle is engaged. This valve opens to allow the water to rush down into the bowl, facilitating an effective flush and clearing waste.

Having two valves is essential for the efficient operation of a toilet. The fill valve ensures that the tank is properly filled, while the flush valve enables the release of water at the right moment to achieve a successful flush.