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📘 A flush is a fast transfer of stored water

A tank toilet stores a measured volume of water above the bowl, then releases most of it quickly.

4
lessons
~20 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. Tank and flush valveExplain why water is stored above the bowl and how the flush valve releases it.A raised tank stores water and the flush valve releases it rapidly into the bowl.
  2. Trap and bowl washConnect trapway shape, siphon action, and bowl wash paths.The trapway siphons waste while rim holes and jets wash the bowl.
  3. Refill cycleTrace float control, tank filling, bowl refill, and overflow protection.The float opens the fill valve and a refill tube restores the bowl seal.
  4. Complete cycleReconstruct the full flush-and-refill sequence as one hydraulic system.Gravity, geometry, and valves coordinate one full flush-and-refill sequence.

Questions this course answers

Why is water stored in a tank before a typical flush?

The elevated tank stores water and releases it quickly so the bowl rises enough to drive the flush.

What does the flush valve do when the handle is pressed?

The handle lifts the seal over the tank outlet, allowing stored water to enter the bowl.

What is the trap's important everyday function?

The curved trapway holds a pool of water after the flush, creating a liquid seal.

Why do toilets use rim holes and sometimes a siphon jet?

Rim passages rinse and guide water, while a jet can send a strong stream into the trapway.

What makes the fill valve close after a flush?

The float rises with the refilling water and mechanically closes the fill valve at the set level.

Which sequence best describes a normal tank toilet cycle?

The flush releases stored water, drives the trap discharge, and the fill system restores tank and bowl levels.

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