Parts of a Toilet

Posted on: August 26th, 2016 by Ashton Service Group
Parts of a toilet

Toilets are composed of two main pieces: the tank and the bowl.

Tank: The purpose of the tank is to act like a bucket of water. You have to get enough water into the bowl fast enough to activate the siphon. The tank holds several litres of water, which it takes about 30 to 60 seconds to accumulate. When you flush, all of the water in the tank is dumped into the bowl in about three seconds.

Lift chain: connects the flush lever (handle) to the flush valve and opens the flapper.

Flush lever and flush valve: There is a chain attached to the handle (flush lever) on the side of the tank. When you push on the handle, it pulls the chain, which is connected to the flush valve. The chain lifts the flush valve, which then floats out of the way, revealing a 5.08- to 7.62-cm diameter drain hole. Uncovering this hole allows water to enter the bowl. In most toilets, the bowl has been molded so that the water enters the rim, and some of it drains out through holes in the rim. A good portion of the water flows down to a larger hole at the bottom of the bowl.

Siphon tube/ Siphone jet: The hole located at the bottom of the bowl is known as the siphon jet. It releases most of the water directly into the siphon tube. Because all of the water in the bowl enters the tank in about three seconds, it is enough to fill and activate the siphon effect, and all of the water and waste in the bowl is sucked out. The siphon sucks the water out of the bowl and down the sewer line. As soon as the bowl empties, air enters the siphon tube, producing that gurgling sound and stopping the siphoning process.

Flapper (flush valve seat): A flapper is located at the bottom of the tank. The flapper lifts when the toilet is flushed and lets the water flow from the tank into the bowl. When water seems to trickle through a toilet long after it has been flushed, a worn rubber flapper valve at the bottom of the tank is probably to blame.

The purpose of the toilet tank and the flush valve is to hold and then dump about 2 gallons (7.6 L) of water very quickly into the bowl. Once the tank has emptied, the flush valve sits back at the bottom of the tank, covering the drain hole so the tank can be refilled. It is the job of the refill mechanism to fill the tank back up with enough water to start the whole process again.

Filler float aka ball float: The refill mechanism valve turns the water on when the filler float falls. The float falls when the water level in the tank falls.

Filler valve: The filler valve (or refill valve) sends water in two directions. Some of the water goes down the refill tube and starts refilling the tank. The rest goes through the bowl refill tube, and down the overflow tube into the bowl. This refills the bowl slowly. As the water level in the tank rises, so does the float. When the float rises high enough it turns the valve off.

Overflow tube: The overflow tube is present to prevent the toilet tank from overflowing and flooding the bathroom. It directs the extra water into the bowl instead of onto the floor.

Trap: Holds water in the bowl, blocking the entry of sewer gases, until the flow from the tank pushes the water over the weir.

Weir: The S-shape visibly snaking out the back of most toilets. When water reaches the top of the trapway also called the weir when the toilet is flushed, gravity pulls it into the downward leg of the S.

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